Question 2
Why are the 150 N and 200 N forces pushing the motor car parallel rather than collinear?
The right answer is the one marked above.
They act at different points on the object, so there are two lines of action. One direction, but two lines.
They are not in opposite directions — both point the way the car has to go. A difference in magnitude is irrelevant; two equal forces can be parallel too. And if they were perpendicular they would be inclined forces.