Rate of change

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 is increased by 100 percent, which of the following is closest to
the percent change in the concentration of chemical A to keep the reaction
unchanged?

A) 100% decrease
B) 50% decrease
C) 40% decrease
D) 40% increase
E) 50% increase

D