How did empire building benefit farm production?
a. by reducing population pressure
b. by providing more labor resources
c. by expanding trade alliances
d. by making available fertile flatlands
(d my answer)

The answer from the given choices is "B", "Providing more labor Resources".

Empire building benefits farm production by providing more labor resources. As more labor resources means more hands on farm production which ultimately will make the process faster generating more benefits. An empire also allowed people to interact in better ways increasing mutual co-operation.

she will pay the extra amount