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: Rougher surfaces have more friction between them than smoother surfaces.
Question: A piece of sandpaper was rubbed across a glass table, then the sandpaper was rubbed across some gravel. The friction will be greater between
Choices: A)the sandpaper and the glass table or
B)the sandpaper and the gravel.
the sandpaper and the gravel.