Brad and Matt are working in the lab. They noticed that when they mixed two dilute solutions together, the reaction between them happened very slowly. The following are Matt's suggestions. Which one would BEST help to increase the rate of this reaction?

Aincrease the concentration of both solutions

Bdecrease the concentration of both solutions

Eliminate

Cincrease the concentration of one of the solutions

Ddecrease the concentration of one of the solutions