Different velocity-time graph lines are shown, displaying the behavior of multiple race carts along a linear track.

which description correctly identifies cart c?

a) has a positive acceleration and is speeding up.

b) moving with zero acceleration.

c) moving at a constant acceleration.

d) has a negative acceleration and is slowing down.

(cart c is an almost straight line going downwards just a hair, and this is a velocity-time graph. oof nvm apparently correct answer was b. srry stupid usa test prep)