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: The electrons with the _____ energy are nearest to the nucleus. 
 Option1: most 
 Option2: least 
 Explanation: Electrons at higher energy levels, which are farther from the nucleus, have more energy.
[EX A]: least

[EX Q]: Question: Compared to a tidal wave , will a ripple in a mud puddle move water particles 
 Option1: not as far? 
 Option2: farther 
 Explanation: The more energy the wave has, the farther the particles of the medium move.
[EX A]: not as far?

[EX Q]: Question: Milo uses an engine to produce energy at his job. If his engine starts producing more wasted output energy, what would happen to the efficiency of his system? 
 Option1: more efficient 
 Option2: less efficient 
 Explanation: The greater the wasted output energy, the less efficient the system.
[EX A]:
less efficient