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: 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.

SOLUTION: decrease it

PROBLEM: Question: Mike lives in the USA while Mosha lives in Nigeria, which likely uses less energy on a daily basis? 
 Option1: Mike 
 Option2: Mosha 
 Explanation: People in the richer nations of the world use far more energy, especially energy from fossil fuels, than people in the poorer nations do.

SOLUTION: Mosha

PROBLEM: Question: What are the energy levels that are in a very short wave? 
 Option1: high 
 Option2: low 
 Explanation: Waves with greater amplitudes or shorter wavelengths have more energy.

SOLUTION:
low