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: If the speed of a stream decreases, the size of the particles carried in that stream 
 Option1: increase 
 Option2: decrease 
 Explanation: In erosion, a slower moving stream will only carry smaller particles.

A: decrease
****
Q: Question: Dan needs to stay warm in the woods, and can bring one animal for body heat to sleep next to him. Given the choice between a horse and cat, Dan will choose the 
 Option1: cat 
 Option2: horse 
 Explanation: Therefore, an object with more mass has greater thermal energy than an object with less mass, even if their individual atoms are moving at the same speed.

A: horse
****
Q: Question: Ease of mobility _____ when the animal is increased in size. 
 Option1: increase 
 Option2: decrease 
 Explanation: The larger the animal, the heavier the exoskeleton, making movement more difficult.

A:
decrease
****