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).

[Q]: Paragraph: The trade-off when the threads are closer together, is that more turns of the screw or bolt are needed to do the job because the distance over which the input force must be applied is greater.
Question: Compared to a drywall screw with a coarse thread, would a lag bolt of the same length with a very fine thread require
Choices: A)fewer turns to drive into a hole>
B)more turns to drive into a hole
[A]: more turns to drive into a hole

[Q]: 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 less between
Choices: A)the sandpaper and the glass table or
B)the sandpaper and the gravel.
[A]: the sandpaper and the glass table or

[Q]: Paragraph: The main law is the law of superposition. This law states that deeper rock layers are older than layers closer to the surface.
Question: If Jim is exploring layers of rock and he moves deeper into the Earth, what happens to the age of the rock?
Choices: A)older
B)younger
[A]:
older