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.
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Question: Question: John turned down the thermostat in his room. As the temperature of the room got lower, would the air pressure in the room 
 Option1: decrease? 
 Option2: increase 
 Explanation: Decreasing air temperature increases atmospheric pressure.

Answer: increase


Question: Question: If Mona is a sculptor and she is making two clay vases, what happens if she increases the mass of the vases by adding clay to them? 
 Option1: gravitational force of attraction is stronger 
 Option2: gravitational force of attraction is weaker 
 Explanation: The greater the mass of the objects, the stronger the gravitational force of attraction between them.

Answer: gravitational force of attraction is stronger


Question: Question: A rock has more mass then a pebble. Which object will exhibit a greater 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.

Answer:
rock