How might the timing of when fruit ripens be important in the sympatric speciation of fruit maggot flies?

a)apple fruit ripening earlier allows for increased reproductive output for the flies.
b)apple fruit ripens earlier than hawthorn fruit, allowing the apple flies to immediately mate with the later-emerging hawthorn flies.
c)apple fruit ripens earlier than hawthorn fruit, reducing the interaction of the fly species in time.
d)apple fruit ripening earlier is a vicariant event.