A) Flies from other areas moved in and replaced those killed by DDT
B) The few flies that were affected by DDT got survived and developed resistance to DDT which they passed on to their descendants
C) The DDT caused new mutations to occur in the surviving flies and this resulted in resistance to DDT
D) The DDT killed susceptible flies but the few that were naturally resistant lived and reproduced and their offspring repopulated the area
Correct Answer: D
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