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: An increase in frequency means wavelength has 
 Option1: increased 
 Option2: decreased 
 Explanation: As wavelength increases, frequency decreases.

SOLUTION: decreased

PROBLEM: Question: A small planet has a _____ pull of gravity than a small planet. 
 Option1: stronger 
 Option2: weaker 
 Explanation: Gravity is a pull which all matter exerts on all other matter, the more mass, the stronger the pull.

SOLUTION: weaker

PROBLEM: Question: When we have less cars on the road the pollution levels 
 Option1: decrease 
 Option2: increase 
 Explanation: Greater use of oil and other fossil fuels causes more pollution.

SOLUTION:
decrease