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.

Q: 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.

A: deep
****
Q: Question: Ollie was standing for 20 minutes while Jim was running for 20 minutes. Which person likely has temporarily engorged blood vessels? 
 Option1: Jim 
 Option2: Ollie 
 Explanation: Increasing the diameter of the blood vessels increases the amount of blood and heat that moves near the skins surface.

A: Jim
****
Q: Question: If a stream begins moving faster, what will happen to the size of the particles it carries? 
 Option1: get bigger 
 Option2: get smaller 
 Explanation: In erosion, a slower moving stream will only carry smaller particles.

A:
get bigger
****