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:
Plants growing in a pond release a gas that fish need to survive. Which gas do the plants release that fish use?  
 (A) helium (B) hydrogen (C) nitrogen (D) oxygen

Ex Output:
D


Ex Input:
Over a long period of time, some flowering plants have become dependent on honey bees to fertilize their seeds. In recent years, a form of mite has infected and killed the honey bees in many areas of the country. Since this has happened, the once bee-dependent plants with the best chance of surviving are those that  
 (A) grow taller so that the few remaining honey bees will find them. (B) change their flowers so that wind will fertilize them. (C) have always attracted many other insects as well as honey bees. (D) have seeds that stay alive for a long time in the environment.

Ex Output:

C