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.

Where do good bacteria grow to help keep people healthy?  
 (A) in the brain (B) in the blood (C) on the skin (D) on the bones
C

Water vapor sometimes condenses into stratus clouds that are in contact with the ground. What forms as a result of this process?  
 (A) ozone (B) methane (C) fog (D) smoke
C

Daphnee is going to build a model of the solar system for her science project. She decides that a meter (m) will represent one astronomical unit (AU) in her model. Based on this scale, how far away from the Sun would she need to place Earth?  
 (A) one meter (B) two meters (C) three meters (D) four meters

A