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.

Question: When Shane goes swimming in warmer water, he can move about quickly, whereas in cooler water, Shane's movement is 
 Option1: faster 
 Option2: slower 
 Explanation: When a volume of water is cooled, the molecules move less vigorously, so same number of molecules takes up less space and the water is denser.
slower

Question: Dana clipped her nails short, and waited for them to grow out again. When her nails reached a long length, Dana noted that the number of cells within them must have 
 Option1: decreased 
 Option2: increased 
 Explanation: As the nail grows, more cells are added at the nail bed.
increased

Question: Carbon dioxide levels increasing cause the temperature to 
 Option1: decrease 
 Option2: increase 
 Explanation: An increase in greenhouse gases leads to greater greenhouse effect.

increase