instruction:
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:
Skunks spray a strong-smelling liquid to ___.  
 (A) get rid of wastes (B) attract prey (C) defend themselves (D) help nearby plants grow
answer:
C


question:
Campers shouted toward a canyon wall. What characteristic of sound best explains why the campers heard an echo?  
 (A) Sound waves traveled slowly down the canyon. (B) Sound waves were absorbed by the canyon wall. (C) Sound waves reflected off the canyon wall. (D) Sound waves were refracted around the canyon.
answer:
C


question:
An astronomer and a marine biologist were having lunch and discussing their current experiments. They discovered that although they investigate different areas of science, they most likely use the same  
 (A) scientific tools used in experiments. (B) publications for conducting research. (C) scientific method to test hypotheses. (D) locations for conducting their experiments.
answer:

C