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: 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.

Answer: pebble


Question: Question: Billy is wearing sunscreen with a lower SPF than Lucy. Who will be protected from the sun for longer? 
 Option1: Lucy 
 Option2: Billy 
 Explanation: A sunscreen with a higher SPF protects the skin longer.

Answer: Lucy


Question: Question: Compared to microwaves do x-rays, which have a much shorter wavelength than microwaves, have a 
 Option1: lower frequency? 
 Option2: higher frequency 
 Explanation: Because all electromagnetic waves travel at the same speed through space, a wave with a shorter wavelength must have a higher frequency, and vice versa.

Answer:
higher frequency