The main economic constraints of agroforestry are:

A. Reduces output of staple food cross, where trees compete for use of arable land and or depress crop yields.
B. In compatibility of trees with agricultural practices such as free grazing, burning, common fields
C. Both (a) & (b)
D. None of these

The correct answer to the question: "The main economic constraints of agroforestry are:" is "Both (a) & (b) ".