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.

In which state are molecules of a substance arranged in the most orderly way?  
 (A) gas (B) liquid (C) plasma (D) solid
D

The basic life functions of an organism are carried on by  
 (A) cells (B) nutrients (C) atoms (D) hormones
A

Plants transform energy when they make their own food. Which type of energy is used by plants for making food?  
 (A) electrical (B) heat (C) light (D) mechanical

C