A graph shows the variation with time t (x-axis) of the acceleration a (y-axis) of a spaceship. The graph has a solid line heading diagonally up from about a quarter up the y-axis. It stops and goes straight down in a dotted line at point on x-axis T. It is shaded underneath this pentagram.The spaceship is at rest at t = 0.

The shaded area represents

A. the distance travelled by the spaceship between t = 0 and t = T.

B. the speed of the spaceship at t = T.

C. the rate at which the speed of the spaceship changes between t = 0 and t = T.

D. the rate at which the acceleration changes between t = 0 and t = T.