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 Q]: Which is a trait that a child can inherit from its parents?
(A) eye color (B) a broken leg (C) length of hair (D) language skills
[EX A]: A

[EX Q]: In gym class a student kicks a soccer ball high into the air. As the ball goes upward, which type of energy is increasing?
(A) kinetic energy (B) thermal energy (C) potential energy (D) mechanical energy
[EX A]: C

[EX Q]: Lemon juice turns litmus paper red, is corrosive and tastes sour. Lemon juice is classified as
(A) an acid. (B) a base. (C) an element. (D) More information is needed to classify lemon juice.
[EX A]:
A