Task: Question Answering
Input (English): Question: The rate of a certain chemical reaction is directly proportional to the square of the concentration of chemical A present and inversely proportional to the concentration of chemical B present. If the concentration of chemical B present is increased by 100 percent, which of the following is closest to the percent change in the the concentration of chemical A required to keep the reaction rate unchanged.

 Option A: 100 % decrease

 Option B: 50% decrease

 Option C: 40% decrease

 Option D: 40% increase

 Option E: 50% increase
Output (English): Option C