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.

[EX Q]: Which of these objects will most likely float in water?  
 (A) glass marble (B) steel ball (C) hard rubber ball (D) table tennis ball
[EX A]: D

[EX Q]: Which physical characteristic of Earth is similar to a physical characteristic of the Moon?  
 (A) its climate (B) its great seas (C) its atmosphere (D) its mountain ranges
[EX A]: D

[EX Q]: Many grass snakes are green. The color of the snake most likely helps it to  
 (A) climb tall trees. (B) fit into small spaces. (C) hide when threatened. (D) shed its skin.
[EX A]:
C