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: If Mary is building a rocket and she wants it to fly as high as possible, what should she do to the mass of the rocket? 
 Option1: increase it 
 Option2: decrease it 
 Explanation: By using multiple stages, empty fuel containers could drop away. This reduced the mass of the rocket so that it could fly higher.
[EX A]: decrease it

[EX Q]: Question: If Mona is heating up popcorn in the microwave and the popcorn begins to move slower, what happens to the temperature of the kernels? 
 Option1: increase 
 Option2: decrease 
 Explanation: When particles move more slowly, temperature is lower and an object feels cooler.
[EX A]: decrease

[EX 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 older? 
 Option1: Rock A 
 Option2: Rock B 
 Explanation: Older rocks are at the bottom and younger rocks are at the top.
[EX A]:
Rock B