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.

One important use of coal is to produce energy for homes. Coal can be burned and converted to
(A) wind energy. (B) nuclear energy. (C) electrical energy. (D) solar energy.
C

Which is an example of a chemical reaction?
(A) Vinegar added to baking soda forms a gas. (B) Water evaporates into air. (C) Sugar dissolves in water. (D) Corn kernels are crushed to form flour.
A

After nitrogen becomes part of the lithosphere, what is the next change that nitrogen will undergo?
(A) used as a nutrient by plants (B) fixed by bacteria in the soil (C) converted into oxygen (D) absorbed into the atmosphere by lightning
B