The function $h,$ defined by $h(t)=a t+b,$ where $a$

and $b$ are constants, models the height, in

centimeters, of the sunflower after $t$ days of growth

during a time period in which the growth is

approximately linear. What does a represent?

A) The predicted number of centimeters the

sunflower grows each day during the period

B) The predicted height, in centimeters, of the

sunflower at the beginning of the period

C) The predicted height, in centimeters, of the

sunflower at the end of the period

D) The predicted total increase in the height of the

sunflower, in centimeters, during the period