Question
Passage: “The kola nut, native to West Africa, contains caffeine and theobromine — making it a natural stimulant. Historically, the nut was chewed during ceremonies and long meetings to maintain alertness. Today, kola extracts are still used in some traditional beverages, though synthetic caffeine has largely replaced them in industrial cola production.”
Question: What is the main idea of the passage?
(A) Kola nuts are now banned in industrial production. (B) Kola nuts have a long history as a natural stimulant, though largely replaced by synthetic caffeine in modern beverages. (C) Kola nuts are only found in West Africa. (D) Theobromine is the primary stimulant in kola nuts.
Solution — Step by Step
The passage has three sentences, each adding information:
- What kola nuts are and why they stimulate.
- Their historical use.
- Their modern status (largely replaced).
The passage tracks kola nuts from origin → historical use → modern replacement. The connecting thread: kola nuts as a natural stimulant with a fading commercial role.
(A) “Banned” — passage says “largely replaced,” not banned. Wrong.
(B) Captures both the historical role AND the modern shift. Matches the passage’s full arc. Likely correct.
(C) “Only” is too strong. The passage doesn’t say kola nuts are exclusively in West Africa — just that they’re native there.
(D) The passage mentions both caffeine and theobromine without saying which is primary. Misrepresents the passage.
Answer: (B). It captures both halves of the passage — historical importance and modern decline.
Why This Works
The “main idea” question is about finding the answer choice that captures the broadest correct claim. Strong main idea answers track ALL parts of the passage; weak ones grab only one detail.
The trap answers in this question are textbook: (A) extreme word (“banned”), (C) absolute claim (“only”), (D) misrepresented detail (which stimulant is “primary”).
Speed shortcut for main idea: Skim the passage, then for each answer choice ask “Does this cover BOTH the first half and the second half?” The correct choice does; trap choices grab only one half or add extra claims.
Alternative Method — Elimination by Extreme Words
Cross out any choice with extreme words (“always,” “only,” “never,” “banned”) unless the passage explicitly supports them. This eliminates (A) and (C) instantly.
Then between (B) and (D), pick the one tied directly to the passage. (D) requires inference; (B) restates explicitly stated information. (B) wins.
Common Mistake
Students often pick (D) because they recall the chemistry — caffeine and theobromine are both methylxanthines, and people might associate caffeine more with coffee, theobromine more with chocolate. The SAT doesn’t care about your science knowledge — only what the passage says.
Another classic: choosing the longest, most detailed answer because it “sounds smart.” On main idea questions, the correct answer is usually the one that summarises rather than the one that drops most facts.
Information and Ideas questions make up ~25% of SAT R&W. Master the “track-the-arc” approach for main idea questions — high accuracy gain with consistent practice.
The Digital SAT also pairs main idea questions with longer passages — same logic, just more text. The unifying-theme question always wants the broadest accurate option.