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.

[EX Q]: Question: The the planets are colder than sun because they are 
 Option1: less massive 
 Option2: more massive 
 Explanation: An object with more mass has greater thermal energy than an object with less mass because it has more atoms.
[EX A]: less massive

[EX Q]: Question: John was watching objects fall from the sky in the simulator. He observed that items with more mass will be pulled by gravity at a rate that is 
 Option1: Stronger 
 Option2: Weaker 
 Explanation: Gravity is a pull which all matter exerts on all other matter, the more mass, the stronger the pull.
[EX A]: Stronger

[EX Q]: Question: A vehicle that was sleek and aerodynamic and a vehicle that was bulky were each driven the same distance over the same amount of time. Which vehicle needed to more energy to power it? 
 Option1: bulky vehicle 
 Option2: sleek vehicle 
 Explanation: Lighter, more streamlined vehicles need less energy.
[EX A]:
bulky vehicle