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: If Mona is exploring and aquifer and she dives deeper down into it, what happens to the levels of fossil water she encounters? 
 Option1: they increase 
 Option2: they decrease 
 Explanation: Deeper aquifers typically contain older 'fossil water.'

A: they increase
****
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: James slid an anvil across the floor, then slid a pillow across the floor. Which object slid the shorter distance before stopping? 
 Option1: anvil 
 Option2: pillow 
 Explanation: Heavier objects press together with greater force, and this causes greater friction between them.

A:
anvil
****