I would just like to put a point why 'C' must be wrong option
C -In recent years, consumers in California boycotted domestic cherries, demanding better working conditions for agricultural laborers in the state.
"In California, for example, domestic cherries are exported to Canada and Japan,
while a nearly equivalent number of cherries are imported from Chile, Italy, and Germany." This is mentioned in the Question.
If people Boycott cherries then why would they import them from other countries..?
One might say they are boycotting domestic cherries for improving Labour conditions and hence are purchasing imported cherries, but that any way doesn't solve the cause why people abandon cherries.
Coming to the point raised on the economic gain of making money from cherries rather than wasting the produce - we are not talking about a particular year's produce when people started boycotting, rather both boycotting and production continued for few years - "In recent years, consumers in California boycotted domestic cherries,"
If we talk about the gains regarding improving labour conditions - this might not be an economic gain and not a rationale definitely for economic gain as was already explained above..!
I am sure you got this by now, but just to make it clear to someone who read this discussion.