TASK DEFINITION: You are given a question or fill-in-the-blank question, two answer options (Option1 and Option2) and an Explanation. Your task is to find the correct answer (return the string of the correct option, not option1/2) for the given question from the given options and using explanation.
PROBLEM: Question: If Jim is screwing in two bolts and the first one has threads that are close together while the second one has threads that are far apart, which one must he apply less force to? 
 Option1: first bolt 
 Option2: second bolt 
 Explanation: 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.

SOLUTION: second bolt

PROBLEM: Question: Will drilled 1000 feet to find a rock. Harry picked a rock up off of the ground. Whose rock is likely older? 
 Option1: Will 
 Option2: Harry 
 Explanation: Therefore, deeper rock layers must be older than layers closer to the surface.

SOLUTION: Will

PROBLEM: Question: Compared to a box of feathers a box of bricks would be 
 Option1: lighter 
 Option2: heavier 
 Explanation: A given volume of a denser substance is heavier than the same volume of a less dense substance.

SOLUTION:
heavier