Acar is moving at a constant speed along a straight line. which statement is true about the forces acting on the car?
oa. the net force acting on the car from all directions is zero.
b. the net force acting on the car is greater than the car's weight.
c.
the net force acting on the car is in the direction of the car's motion,
d.
the net force acting on the car is in the opposite direction of the car's motion.

Yes, there is no NET FORCE on the object.

Explanation:

However, there are forces acting on the object.

There is  

friction

opposing the motion of the object, but it is exactly balanced out by a constant force in the opposite direction. Since both forces are balanced, you don't see any slowing down or speeding up as a result and the net force results to be zero - speed is constant.

Since the question doesn't state to ignore friction, friction is assumed to be at play here.

There are also forces acting on the object in the y direction, but those also balance out, and hence, you don't see the object flying off the ground.

for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .