Answer: B. It costs more than other growing methods.
Step-by-step explanation:
B.It costs more than other growing methods. is the correct option because growing coffee in a shade requires a particular set up like plastic or tin shade whose cost will be more. Also although the it is sustainable for providing a shelter to the forests birds but special measures should be taken so that these coffee plants remain unaffected by the bird population. Hence, it will cost more than the conventional method of farming coffee.