TASK DEFINITION: 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.
PROBLEM: Question: When a rubber band is relaxed, its elastic force 
 Option1: increases 
 Option2: decreases 
 Explanation: The elastic force increases the more the material is stretched or compressed.

SOLUTION: decreases

PROBLEM: Question: What will happen to Jim's muscle strength if he exercises more then he has in the past? 
 Option1: his muscles will become stronger 
 Option2: his muscles will become weaker 
 Explanation: Aerobic exercise increases the size and strength of muscles in the heart and helps all your muscles develop greater endurance.

SOLUTION: his muscles will become stronger

PROBLEM: Question: Boris was tasked with developing a hypersonic rocket. He built two prototypes that were identical except that they have different gas velocities out of the nozzle. Which rocket was likely the slowest? 
 Option1: the rocket with highest gas velocity 
 Option2: the rocket with lowest gas velocity 
 Explanation: The rocket goes upwards because the hot gases shoot downwards out of the nozzle. The faster the gases go downwards, the faster the rocket goes upwards.

SOLUTION:
the rocket with lowest gas velocity