Given the task definition and input, reply with output. 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.

A scientist compares ancient animal tracks to modern animal tracks. Which conclusion is the scientist most likely to reach?
(A) Some ancient animals and some modern animals walk on four legs. (B) Most ancient animals and most modern animals hunt animals for food. (C) The same animals that lived long ago also live today. (D) All animals can walk.
A