Find the Slope Then Describe What It Means in Terms

Find the slope then describe what it means in terms of the rate of change of the dependent variable per unit change in the independent variable.
-The linear function f(x) = 4.3x + 33 represents the percentage of people, f(x) , who graduated from college x years after 1998.

A) m = -4.3; the percentage of people graduating from college has decreased at a rate of 4.3% per year after 1998.
B) m = 4.3; the percentage of people graduating from college has increased at a rate of 4.3% per year after 1998.
C) m = 4.3; the percentage of people graduating from college has decreased at a rate of 4.3% per year after 1998.
D) m = 33; the percentage of people graduating from college has increased at a rate of 33% per year after 1998.