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: A rock has more mass than a pebble. Which object will exhibit a smaller force of attraction? 
 Option1: rock 
 Option2: pebble 
 Explanation: The greater the objects mass, the greater the force of attraction; in addition, the greater the distance between objects, the smaller the force of attraction.

SOLUTION: pebble

PROBLEM: Question: A person takes a deep breath and wants to know if the air outside their lungs is stronger than the air outside. The air outside the body, compared to the air in their chest, when they have a large chest, will be 
 Option1: higher 
 Option2: lower 
 Explanation: During inhalation, because the chest volume is larger, the air pressure inside the lungs is lower than the air pressure outside.

SOLUTION: higher

PROBLEM: Question: Jim puts his water in the oven for later. The molecules in the liquid 
 Option1: speed up 
 Option2: slow down 
 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.

SOLUTION:
speed up