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: John was weighing some materials in his science lab. He observed that as objects had lower density, the heaviness of the objects 
 Option1: Increased 
 Option2: Decreased 
 Explanation: A given volume of a denser substance is heavier than the same volume of a less dense substance.

SOLUTION: Decreased

PROBLEM: Question: David is getting ready to fly into space on a rocket. As the rocket shoots upwards, part of the mass attaches, allowing the rocket to go 
 Option1: higher 
 Option2: lower 
 Explanation: By using multiple stages, empty fuel containers could drop away. This reduced the mass of the rocket so that it could fly higher.

SOLUTION: lower

PROBLEM: Question: Rich applies a solution to the dish that increases the turgor pressure of the guard cells he is studying. The stomata 
 Option1: close 
 Option2: open 
 Explanation: The increase in turgor pressure of the guard cells results in the opening up of the stomata which results in increased transpiration.

SOLUTION:
open