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 major difference between the life cycles of different types of plants?
(A) the way they die (B) the energy they use (C) the way they reproduce (D) the way they make food
[EX A]: C

[EX Q]: A puppy has traits from its mother and its father. Which of these structures provides genetic information from the father to the puppy?
(A) a muscle cell (B) a nerve cell (C) a blood cell (D) a sperm cell
[EX A]: D

[EX Q]: Grooves running down the sides of a riverbank are most likely caused by
(A) wind. (B) rocks. (C) leaves. (D) rainwater.
[EX A]:
D