Answer:
The force that the windshield exerts on the bug and the force that the bug exerts on the windshield are the same magnitude.
Explanation:
In this context, both forces are the same but in opposite directions, according to the third Newton's Law: Every action has an equal and opposite reaction. One clear example is when we are sitting, our weight has an opposite reaction, which is equal, the normal force, totally opposite to the weight.
Therefore, in this case, the third answer is the correct one. Because the force exerted by the bug must be equal and opposite to the exerted by the windshield, if they weren't opposite, the bud wouldn't be smashed.
