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.

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.'
they increase

Question: If Milo calms down and his heart starts pumping less blood with each stroke, what happens to his heart rate?
Option1: increases
Option2: decreases
Explanation: When the heart expels more blood with each stroke, the heart has to beat less often in order to maintain the same volume of blood flow.
increases

Question: If you added more citric acid to orange juice the acid levels would
Option1: decrease
Option2: increase
Explanation: A stronger acid produces a greater concentration of ions than a weaker acid.
increase