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: Mel stops after running down the street for exercise. As Mel's heart rate decreases, Mel's blood flow 
 Option1: decreases 
 Option2: increases 
 Explanation: Warming up exercises increases the blood flow to the muscles and increases the heart rate.

SOLUTION: decreases

PROBLEM: Question: If Jim moves his telescope from a mountaintop to Death Valley, a location with much air above it, what will happen to the amount of interference from the atmosphere? 
 Option1: increase 
 Option2: decrease 
 Explanation: Many observatories are built on high mountains. There is less air above the telescope, so there is less interference from the atmosphere.

SOLUTION: increase

PROBLEM: Question: Joan is examining an electron 100nm from the nucleus and an electron 50nm from the nucleus. Which has less energy? 
 Option1: the 50nm electron 
 Option2: the 100nm electron 
 Explanation: Electrons at higher energy levels, which are farther from the nucleus, have more energy.

SOLUTION:
the 50nm electron