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: As two objects move closer together, the force of gravity between them 
 Option1: increases 
 Option2: decreases 
 Explanation: Objects that are closer together have a stronger force of gravity between them.

SOLUTION: increases

PROBLEM: Question: If Milo traps gases in a small chamber after having them in a large chamber, what will happen to the rate of collisions between gas particles? 
 Option1: increase 
 Option2: decrease 
 Explanation: This means the rate of diffusion is much slower in liquids than in gases, because the particles of a gas are further apart and collide much less.

SOLUTION: increase

PROBLEM: Question: Mike is trying to make two different things slide across the ground. One is block, the other is a chair. The thing that will be hardest to push has 
 Option1: more mass 
 Option2: less mass 
 Explanation: Its harder to overcome friction between heavier objects and the floor than it is between lighter objects and the floor.

SOLUTION:
more mass