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.

Q: Question: As Cindy swam closer to the ocean surface, it got lighter and _____. 
 Option1: warmer 
 Option2: cooler 
 Explanation: Water density increases as salinity and pressure increase, or as temperature decreases.

A: warmer
****
Q: Question: Rick had a rock (Rock A) from 1000 feet beneath the crust's surface. He later dug 3000 feet deeper and got a second rock (Rock B). Which rock is likely younger? 
 Option1: Rock A 
 Option2: Rock B 
 Explanation: Older rocks are at the bottom and younger rocks are at the top.

A: Rock A
****
Q: Question: If Jim is playing with two objects and he moves them closer together to each other, what will happen to the gravitational force between the two objects? 
 Option1: increase 
 Option2: decrease 
 Explanation: The further objects are away from each other, the smaller the gravitational force.

A:
increase
****