TASK DEFINITION: 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.
PROBLEM: Question: Dan is swimming into shallower water. The water the shallower he goes will be 
 Option1: younger 
 Option2: older 
 Explanation: Deeper aquifers typically contain older 'fossil water.'

SOLUTION: younger

PROBLEM: Question: What happens to a light car when it has the same power as a heavy car? 
 Option1: accelerates faster 
 Option2: accelerates slower 
 Explanation: The smaller its mass is, the greater its acceleration for a given amount of force.

SOLUTION: accelerates faster

PROBLEM: Question: Which object likely contains more energy? 
 Option1: a pinhead 
 Option2: the sun 
 Explanation: An object with greater mass or greater velocity has more kinetic energy.

SOLUTION:
the sun