instruction:
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:
Question: Sandra sees a tiny glacier, and notes that it has smaller tributary glaciers flowing into it, in valleys that are 
 Option1: shallow 
 Option2: deep 
 Explanation: Smaller tributary glaciers, like tributary streams, flow into the main glacier in their own shallower U-shaped valleys.
answer:
deep


question:
Question: Milo owns two telescopes, one at the top of a mountain and one at the base. If he looks through the one at the top of the mountain, how much interference can he expect compared to the one at the top of the mountain? 
 Option1: more 
 Option2: less 
 Explanation: Many observatories are built on high mountains. There is less air above the telescope, so there is less interference from the atmosphere.
answer:
more


question:
Question: As Cindy swam closer to the ocean surface, it got lighter and _____. 
 Option1: warmer 
 Option2: cooler 
 Explanation: Water density increases as salinity and pressure increase, or as temperature decreases.
answer:

warmer