TASK DEFINITION: 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.
PROBLEM: Which is a process that occurs during photosynthesis?  
 (A) Plants take in oxygen and release sugar. (B) Plants take in sugar and release minerals. (C) Plants take in minerals and release carbon dioxide. (D) Plants take in carbon dioxide and release oxygen.

SOLUTION: D

PROBLEM: What is the primary function of white blood cells in humans?  
 (A) carry oxygen (B) fight disease (C) grow tissues (D) remove waste

SOLUTION: B

PROBLEM: Water moves by capillary action through soil from moist areas to dry areas. Which property of water is most responsible for this capillary action?  
 (A) Water is a polar molecule. (B) Water contains an oxygen atom. (C) Water has a high surface tension. (D) Water has a high specific heat.

SOLUTION:
C