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: Will's spaceship flew further and further from the sun. The temperature _____ over time. 
 Option1: increased 
 Option2: dropped 
 Explanation: The stratosphere gets most of its heat from the Sun. Therefore, its warmer closer to the Sun.
dropped

Question: Sarah's plants have been greatly photosynthesizing regularly, so that means that the plants now produce food in amounts that are 
 Option1: lesser 
 Option2: greater 
 Explanation: Less photosynthesis means that plants and phytoplankton produce less food.
greater

Question: When it is very cold what happens to the speed of items? 
 Option1: speed up 
 Option2: slow down 
 Explanation: For a given medium, sound waves travel more slowly at lower temperatures.

slow down