*30 POINTS + BRAINLIEST ANSWER*

Gravity is pulling an object into the sun. The closer the object gets to the sun, the greater the gravitational force that acts on the object, increasing its acceleration. A line graph plotting the speed of the object against time would have which shape?

A: straight line of positive slope

B: curved line that slopes upward

C: curved line that slopes downward

D: straight line of negative slope