Final answer:
The correct conclusion is that the small car is applying a greater force than the large truck.
Step-by-step explanation:
The correct conclusion that can be drawn from the situation of a small car pushing a large truck and both speeding up is that the small car is applying a greater force than the large truck. Acceleration is directly proportional to the net force applied to an object, which means that the object experiencing the greater force will have a higher acceleration. In this case, the small car is able to exert a greater force on the large truck, causing it to accelerate faster.