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: The parts of plants that make seeds are the  
 (A) roots. (B) stems. (C) flowers. (D) leaves.

A: C
****
Q: A scientist studies the remains of two extinct animals to learn more about how they lived. She determines that one animal was a carnivore and the other was an herbivore. Which of the following did the scientist most likely compare to make this conclusion?  
 (A) the number of bones in the animals (B) the size of the animals (C) the body covering of the animals (D) the skull of the animals

A: D
****
Q: Sandy and Keith plan to move a 6-kilogram block. If they wanted to calculate the mechanical energy required to move the block, what units would they use to report their answer?  
 (A) joules (B) kilowatts (C) kilometers (D) volts

A:
A
****