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: Do electric cars pollute more or less than gas cars? 
 Option1: more 
 Option2: less 
 Explanation: Plug-in hybrids run for a longer time on electricity and so are less polluting than regular hybrids.

SOLUTION: less

PROBLEM: Question: As two objects move closer together, the force of gravity between them 
 Option1: increases 
 Option2: decreases 
 Explanation: Objects that are closer together have a stronger force of gravity between them.

SOLUTION: increases

PROBLEM: Question: If one tree has smaller leaves then the other, which one will lose the most water vapour? 
 Option1: tree with smaller leaves 
 Option2: tree with bigger leaves 
 Explanation: Leaves can have the following adaptations to reduce transpiration rate: Small or narrow leaves to reduce the surface area over which water vapour is lost

SOLUTION:
tree with bigger leaves