1.Stock A has a Treynor measure of 1.8% while stock B has a Treynor measure of 1.6%.Assuming stock A is presently fairly priced then the Beta of stock B is predicted, according to efficient markets, to:

A)Increase by 0.2%

B)Increase by approximately 12.5%

C)Decrease by approximately 11.1%

D)Decrease by 0.2%

E)Cannot be computed with the information provided

I kind of found the answer by trial-and-errors but I would like to know the reasoning behind the math. Could someone explain to me please.