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: Terry sees a cold day outside. He is _____ likely to produce body heat on this day. 
 Option1: more 
 Option2: less 
 Explanation: For example, on a cold day, an endotherm may produce more body heat by increasing its rate of metabolism.

A: more
****
Q: Question: As you travel below the ozone layer the temperatures become 
 Option1: higher 
 Option2: lower 
 Explanation: The stratosphere contains the ozone layer, the temperatures increase as altitude increases.

A:
lower
****