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: Noah compares the density of the water in a pond during a hot July day and a cold winter morning. The water on the July day is 
 Option1: more dense 
 Option2: less dense. 
 Explanation: Lower temperature and higher salinity yield the densest water.

SOLUTION: less dense.

PROBLEM: Question: Dan wanted to be able to see the most light and detail when buying a telescope. Dan decided to buy a telescope that was 
 Option1: smaller 
 Option2: larger 
 Explanation: Larger telescopes can collect more light and see finer details than smaller telescopes.

SOLUTION: larger

PROBLEM: Question: What will happen to the levels of pollution on Earth if the population decreases? 
 Option1: they will rise 
 Option2: they will fall 
 Explanation: For example, more people on the Earth means more people contributing to global warming and pollution.

SOLUTION:
they will fall