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: If John heats a gas in his bunsen burner, what would happen to the gas particles?
Option1: they would move faster
Option2: they would move slower
Explanation: If the gas is heated, the particles will move faster as they gain more energy.

SOLUTION: they would move faster

PROBLEM: Question: Megan had two charged metal balls that she was analyzing. If she decreases the charge of the balls, the electrostatic force between them
Option1: decreases
Option2: increases
Explanation: The more charged the objects are, the stronger the electrostatic force between them.

SOLUTION: decreases

PROBLEM: Question: A chemist compared two substances in the lab. Which substance will have a lower concentration of hydrogen ions?
Option1: the substance with the higher pH
Option2: the substance with the lower pH
Explanation: The lower the pH value is, the greater is the concentration of hydrogen ions and the stronger the acid.

SOLUTION:
the substance with the higher pH