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.
--------
Question: A scientist is searching for areas where new solar systems might form. What feature is the scientist looking for?
(A) a star similar to our Sun (B) a cloud of dust and gas (C) an oxygen-rich atmosphere (D) a gravitational acceleration of 9.8 m/sec2

Answer: B

Question: When do mutations help make an ecosystem more sustainable?
(A) when mutations decrease the number of individuals in an ecosystem (B) when mutations increase the number of individuals in an ecosystem (C) when mutations decrease the number of species in an ecosystem (D) when mutations increase the number of species in an ecosystem

Answer: D

Question: What is the source of genetic information of offspring produced by sexual reproduction?
(A) the father only (B) the mother only (C) the mother and the father (D) neither the mother nor the father

Answer:
C