You will be given a definition of a task first, then some input of the task.
You are given a short paragraph, a question and two choices to answer from. Choose the correct answer based on the paragraph and write the answer(not the key).

Paragraph: Older rocks are at the bottom and younger rocks are at the top.
 Question: Tom conducted an archaeological dig and compared some of the rocks he found. He noticed that the rocks at 20 feet deep were _____ than the rocks at 2 feet deep. 
 Choices: A)older 
B)younger
Output:
older