If a^2 and b are directly proportional, and a = 2 when b = 5, then what is b when a=3?

Which function is represented by the graph? a. f(x)=|x-1|+3 b. f(x)=|x+1|-3 c. f(x)=|x-1|-3 d. f(x)=|x+1|+3