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: As the train approached the intersection and blew its horn, expanding the wavelengths of the sound, did the frequency of the horn 
 Option1: increase 
 Option2: decrease? 
 Explanation: This means that as wavelengths get shorter, more waves move past a particular spot in the same amount of time.
decrease?

Question: When going out in the sun you wear a high SPF sunscreen because it protects 
 Option1: worse 
 Option2: better 
 Explanation: A sunscreen with a higher SPF protects the skin longer.
better

Question: Rocks that have a lot of water in them have a 
 Option1: high melting point 
 Option2: low melting point 
 Explanation: As the amount of water increases, the melting point of rock decreases.

low melting point