Given the task definition and input, reply with output. 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: An object has greater momentum if it has greater mass, greater velocity, or both.
 Question: A larger boulder will roll down a hill _____ than a smaller one. 
 Choices: A)faster 
B)slower
faster