Digital PSAT Reading and Writing Practice Question 153: Answer and Explanation

Question: 153

It is said that Benjamin Franklin suggested the use of foxfire (bioluminescent fungi) as a viable light source on an early variety of submarine, _______ it would consume considerably less oxygen than the combustion reactions of candle or lamplight.

Which choice completes the text with the most logical transition?

  • A. but
  • B. previously
  • C. as
  • D. while

Correct Answer: C

Explanation:

(C) "As" conveys a cause-and-effect relationship between Franklin's suggestion and the reason for his suggestion. The other options do not show a cause-and-effect relationship.

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