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: Question: Evan is a farmer and needs to plant on a slope. For a faster flow of water, he should choose a slope that is 
 Option1: steeper 
 Option2: gentler 
 Explanation: A gentle slope favours slower flow of surface water, reduces erosion, and increases availability of water to plants.

Answer: steeper


Question: Question: Polly is analyzing climate change. She deduces that removing heat energy from the atmosphere would _____ to changes in precipitation patterns. 
 Option1: fix 
 Option2: cause 
 Explanation: Adding more heat energy to Earths atmosphere also causes more extreme weather and changes in precipitation patterns.

Answer: fix


Question: Question: When a river gets full of a lot of waste chemicals it becomes 
 Option1: cleaner 
 Option2: dirtier 
 Explanation: More pollutants mean poorer air quality.

Answer:
dirtier