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: Mike wants his voice to travel slowly, so he will speak in a room that is 
 Option1: colder 
 Option2: warmer 
 Explanation: For a given medium such as air, sound has a slower speed at lower temperatures.

SOLUTION: colder

PROBLEM: Question: Dan hits a car with his car. Dan was going only twenty miles an hour, and the other car was stopped. If Dan had hit the car going forty miles an hour, the stopped car would be moved 
 Option1: more 
 Option2: less 
 Explanation: The harder the batter hits the ball, the greater will be its acceleration.

SOLUTION: more

PROBLEM: Question: An increase in body size will cause a concomitant _____ in its surface area to volume ratio. 
 Option1: increase 
 Option2: decrease 
 Explanation: Size restriction: The final body size is limited because as the body size increases, the surface area to volume ratio decreases.

SOLUTION:
decrease