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: When we are increasing energy used while running what will happen? 
 Option1: speed up 
 Option2: slow down 
 Explanation: As the liquid particles lose energy, their movement slows down even more. As their movements become slower and slower, the attractive forces between become stronger.

A: speed up
****
Q: Question: If Milo is part of a smaller population then Jerry is, which person's population will experience greater drifting of allele frequencies? 
 Option1: Milo 
 Option2: Jerry 
 Explanation: The smaller a population is, the more allele frequencies may drift.

A: Milo
****
Q: Question: When water freezes into ice it becomes 
 Option1: less dense. 
 Option2: more dense 
 Explanation: Water becomes more dense when it is colder and when it has more salt.

A:
more dense
****