You are given a science question (hard-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.

[Q]: Sara tums on a flashlight and holds an object up to the light. How will she be able to tell if the object is opaque?  
 (A) No light will shine through. (B) Some light will be reflected. (C) The light will bend at an angle. (D) Light will shine clearly through.
[A]: A


[Q]: Farmers plant fruit trees in an area that was once a grassy meadow. Which will most likely happen to the rabbits living in the meadow?  
 (A) They will learn to eat fruit. (B) They will learn to climb trees. (C) The number of their young will increase. (D) The size of their population will decrease.
[A]: D


[Q]: Which land feature is most likely the result of a glacier?  
 (A) large, arid desert (B) deep, bowl-shaped lake (C) long crack in the ground (D) volcanic mountain range
[A]:
B