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. which of matt's suggestion would best to increase the rate of this reaction?

Here are my reasonable beliefs 
For number 1. what the answer seems to be is C.Than looking are numbers two and three their answers are both B
My reasoning for them is , because if you think about the solid liquid gas's this is a common result in most experiments.also for number two , you have to decrease ( go down ) on the concentration ( hardness ) of the subject to get a more powerful solution
So far as number one , for it to be water the atoms have to be far away from the other moving freely , to be a solid they can barely move at all. 

Increase the concentration of one of the solutions