Answer:
The correct answer is letter "A": Should be.
Step-by-step explanation:
From the efficiency perspective, we shall consider the relationship between the benefits and the costs. If we subtract the cost from the benefits and the result is positive, we could say that it is convenient to continue with the activities of the operations being carried out.
In that case, Jones's benefits are (100) but his cost is Smith's damages (60). Then:
100 - 60 = (+)40;
which implies Jones should be allowed to play his opera music.