Why is it difficult to create sustainable cocoa operations? a. farmers do not have access to cell phones. b. fertilizer is not available in africa. c. valentine's day puts tremendous stress on restaurant supply chains. d. most crops come from a multitude of small farms in africa?

The correct option is D.
It is difficult to sustain coca operations because most crops come from  a multitude of small farms in Africa. 
Cocoa beans which is used for production of various products is majorly produce on a small scale in Africa by subsistence farmers. A company that use cocoa beans as raw material has to source for the beans from various sources.

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