You will be given a definition of a task first, then some input of the task.
In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").

Fact1: radioactive dating is used to determine the age of fossils, Fact2: For a fossil to be made, the dead plant or animal has to be buried rapidly by sediment., Question: What is used to determine the age of plants or animals buried rapidly by sediment? (A) electron microscope (B) ruler (C) carbon dating (D) fossil dating (E) blastoids (F) microscope (G) Physical weathering (H) history books
Output:
C