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.

Currently, Antarctica is the coldest and driest place on Earth. Paleontologists have found dinosaur fossils in rock layers below the ice. Based on this evidence, which is a reasonable conclusion about the climate of Antarctica in the past?
(A) Antarctica has always had the same climate as at present. (B) At some time in the past, Antarctica was a hot, dry desert. (C) At some time in the past, Antarctica was much warmer and wetter. (D) At some time in the past, Antarctica was colder and wetter than it is now.
C