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.

Q: A leaf is covered in mud during a landslide. After one million years, this leaf will most likely be ___.  
 (A) a fossil (B) an animal species (C) a new plant species (D) a nonrenewable fuel

A: A
****
Q: Which disease is a result of abnormal cell division?  
 (A) AIDS (B) cancer (C) chicken pox (D) common cold

A: B
****
Q: Otto pushed a toy car across a floor. The car traveled fast across the wood, but it slowed to a stop on the carpet. Which best explains what happened when the car reached the carpet?  
 (A) Inertia decreased. (B) Gravity increased. (C) Friction increased. (D) Magnetism decreased.

A:
C
****