You are given a science question (easy-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.

Ex Input:
As water cools to a temperature of zero degrees Celsius and forms ice, water molecules tend to  
 (A) move farther apart. (B) vibrate rapidly. (C) flow more randomly. (D) gradually expand.

Ex Output:
A


Ex Input:
Which particle type can be identified as being from a specific element?  
 (A) electron (B) atom (C) neutron (D) proton

Ex Output:
B


Ex Input:
Which statement best describes the climate of Nevada?  
 (A) Temperature at night dropped behind a cold front. (B) Wind increased during the day. (C) Humidity is low throughout every summer. (D) Air pressure increased gradually all week.

Ex Output:

C