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.

Q: Question: Mark is boiling alkenes and wants to see which will boil first; the larger ones or the smaller ones. The alkenes that will boil first are the ones that are 
 Option1: smaller 
 Option2: larger 
 Explanation: Larger alkenes have lower boiling and melting points.

A: larger
****
Q: Question: Dan was excited to try out an electromagnet and was happy when it was very effective. He knew however that if he changed the current he could make it weaker. How should he adjust the current? 
 Option1: decrease it 
 Option2: increase it 
 Explanation: The more current, the stronger the electromagnet.

A: decrease it
****
Q: Question: What would happen to Earth's atmosphere if the amount of greenhouse gases in it was increased? 
 Option1: warm up 
 Option2: cool down 
 Explanation: More greenhouse gases trap more heat and warm the atmosphere.

A:
warm up
****