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.

Question: If Mona is excavating an archeological site and she discovers some fossils near the surface then compares them to fossils she found deeper down, which fossils will be younger? 
 Option1: near the surface 
 Option2: deeper down 
 Explanation: Lower rock layers were laid down earlier, so they are assumed to contain older fossils.
near the surface

Question: Terry has a strong base, some bleach, and a weak base, some water. Which likely contains more hydroxide ions? 
 Option1: bleach 
 Option2: water 
 Explanation: A stronger base produces more hydroxide ions than a weaker base.
bleach

Question: If greenhouse gases in the atmosphere were to be halved, Earth will become 
 Option1: cooler 
 Option2: warmer 
 Explanation: If there are more greenhouse gases in the atmosphere, more ultraviolet radiation will be trapped and the Earth will heat up.

cooler