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:
Solids, liquids, and gases are all different states of which of the following?  
 (A) mass (B) matter (C) weight (D) volume

Ex Output:
B


Ex Input:
One advantage of a hand lens over a microscope is that the hand lens  
 (A) is easier to carry on field investigations. (B) is less likely to be infected by bacteria. (C) makes very tiny objects appear larger. (D) produces a more accurate image.

Ex Output:
A


Ex Input:
Visible light is which type of wave?  
 (A) seismic (B) mechanical (C) longitudinal (D) electromagnetic

Ex Output:

D