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.

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

One type of animal hatches from an egg, breathes through gills when it is young, and mainly lives on land as an adult. Into which group is this animal classified?  
 (A) amphibians (B) birds (C) mammals (D) reptiles
A

Which of these is a reason that scientists revise theories?  
 (A) public opinion in favor of a revised theory (B) corporate sponsorship of a revised theory (C) government policy based on a revised theory (D) experimental results that support a revised theory

D