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 we are increasing energy used while running what will happen? 
 Option1: speed up 
 Option2: slow down 
 Explanation: As the liquid particles lose energy, their movement slows down even more. As their movements become slower and slower, the attractive forces between become stronger.
speed up

Question: Peter added salt to his juice one morning. The mixture became _____ dense. 
 Option1: more 
 Option2: less 
 Explanation: If salt is added to a volume of water, there are more molecules in the same volume, so the water is denser.
more

Question: A group of settlers decided to live close to one aquifer instead of another aquifer because the aquifer they chose was much farther from the surface. Getting water from the aquifer farther from the surface will be 
 Option1: easier 
 Option2: more difficult. 
 Explanation: The closer to the surface an aquifer is, the easier it is to get the water.

more difficult.