I agree with you the answer is A
Answer:
The velocity
of the cart with respect to the ground is

if we consider North the positive y-direction and East the positive x-direction.
Explanation:
We have for relative motion the following expression:

Where
is the velocity of the cart with respect to the ground,
is the velocity of the cart with respect to the plane and
is the velocity of the plane with respect to the ground.
We find that:


Thus:
Power = energy/time=20/4=5.0
The pictures are not attached, therefore, I cannot give a specific choice.
However, I will try to help you out.
The angle of incidence is defined as the angle formed between the ray of light and the normal to the surface that the ray is falling on.
The angle of incidence can be shown in the attached image.
Therefore, for your question, choose the image on which the above description applies.
Hope this helps :)