Find the Slope Then Describe What It Means in Terms $f ( x ) = 3.8 x + 33$

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 $f ( x ) = 3.8 x + 33$ represents the percentage of people, $f ( x )$ , who graduated from college $x$ years after 1998 .

A) $\mathrm { m } = 3.8$ ; the percentage of people graduating from college has increased at a rate of $3.8 \%$ per year after 1998 .
B) $\mathrm { m } = - 3.8$ ; the percentage of people graduating from college has decreased at a rate of $3.8 \%$ per year after $1998 .$
C) $m = 33$ ; the percentage of people graduating from college has increased at a rate of $33 \%$ per year after $1998 .$
D) $\mathrm { m } = 3.8$ ; the percentage of people graduating from college has decreased at a rate of $3.8 \%$ per year after $1998 .$