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: After the pile of tires at the landfill caught on fire, the smoke released into the air made the air quality 
 Option1: better? 
 Option2: worse 
 Explanation: More pollutants mean poorer air quality.

SOLUTION: worse

PROBLEM: Question: Sue is moving from a cold city in Canada to a warm tropical island. The type of vegetation and rate of biological weathering be _____ in Sue's new habitat after she makes the move. 
 Option1: greater 
 Option2: lesser 
 Explanation: The warmer a climate is, the more types of vegetation it will have and the greater the rate of biological weathering.

SOLUTION: greater

PROBLEM: Question: Sandra sees a tiny glacier, and notes that it has smaller tributary glaciers flowing into it, in valleys that are 
 Option1: shallow 
 Option2: deep 
 Explanation: Smaller tributary glaciers, like tributary streams, flow into the main glacier in their own shallower U-shaped valleys.

SOLUTION:
deep