Correct answer to a "Multiple choice" Question?

Question

Read the following paragraph: >Morning is also great for breaking out the vitamins. Supplement absorption bythe body is not temporal-dependent, but naturopath Pam Stone notes that the extraboost at breakfast helps us get energised for the day ahead. For improved absorption,Stone suggests pairing supplements with a food in which they are soluble and steeringclear of caffeinated beverages. Finally, Stone warns to take care with storage; highpotency is best for absorption, and warmth and humidity are known to deplete thepotency of a supplement. Now, Answer this MCQ:>Which is NOT mentioned as a way to improve supplement absorption?>**A.** avoiding drinks containing caffeine while taking supplements>**B.** taking supplements at breakfast>**C.** taking supplements with foods that can dissolve them>**D.** storing supplements in a cool, dry environmentI'd written "D" as correct answer, but official IELTS reading answer key says it's "B". How?Option "D" is nowhere mentioned in the paragraph, if it seems, then it's not a way to improve supplement absorption.

Answer 1

Option D is mentioned by counterexample. "warmth and humidity are known to deplete the potency of a supplement." Logically then, the opposite of warmth and humidity (coolness and dryness) would preserve the potency of the supplement.

Using supplements at breakfast has nothing to do with their potency, rather, the author just says it gives us an extra boost and keeps us energized.