Why Does Agricultural Output Tend to Increase Along with Population,in

Why does agricultural output tend to increase along with population,in contrast to Malthus's predictions?

A) Specialization and division of labour tend to increase agricultural output enough.
B) Irrigation, fertilizers, and conservation techniques increase the amount of arable land.
C) In the long run, land is not a fixed resource.
D) The law of diminishing returns only applies in theory, not in practice.