Suppose $y_0$ is the $y$-coordinate of the point of intersection of the graphs below. Complete the statement below in order to correctly describe what happens to $y_0$ if the value of $a$ (in the blue graph of $f(t)=a(1+r)^t$ below) is increased, and all other quantities remain the same.

As $a$ increases, the value of $y_0$
A. increases
B. decreases
C. remains the same