Please Help, Timed Quiz! Which of the following describes the growth rate of the exponential function in the graph below?

A- For each x increase of 1, the y increases by a common difference of 3.
B- For each x increase of 1, the y increases by a common factor of 3.
C- For each x increase of 1, the y increases by 4 more than the previous increase.
D- For each x increase of 1, the y increases by doubling and then adding 1.