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.

[EX Q]: Question: A chemist compared two substances in the lab. Which substance will have a higher concentration of hydrogen ions? 
 Option1: the substance with the higher pH 
 Option2: the substance with the lower pH 
 Explanation: The lower the pH value is, the greater is the concentration of hydrogen ions and the stronger the acid.
[EX A]: the substance with the lower pH

[EX Q]: Question: As the pressure in the atmosphere rises, the air temperature gets 
 Option1: warmer 
 Option2: cooler or 
 Explanation: Increasing air temperature decreases atmospheric pressure.
[EX A]: cooler or

[EX Q]: Question: Sean digs in the dirt and finds rocks that are buried very shallowly. Given how deep they were, Sean can assume that these rocks are 
 Option1: younger 
 Option2: older 
 Explanation: Lower rock layers were laid down earlier, so they are assumed to contain older fossils.
[EX A]:
younger