Given the task definition and input, reply with output. You are given a science question (hard-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.

Scientists claim that the continents of South America and Africa were once a single landmass. All of the following observations support this claim except
(A) the mountains on these continents have similar rocks of the same age. (B) these continents appear to fit together like the pieces of a puzzle. (C) similar fish live in the ocean off the coasts of these continents. (D) the same kinds of fossils have been found on these continents.
C