Answer
The same. The Civic.
Work Step by Step
Newton’s third law says that the force each exerts on the other are of the same magnitude.
However, Newton's second law shows that the equal force on each causes very different accelerations because the two masses aren't the same.
$$a = F/m$$
The less massive car, with the smaller denominator in the above equation, undergoes more acceleration and change in velocity than the truck does.