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Basically (A) says that argument is comparing apples to oranges and thus the argument is not sound.
The comparision should be done between
those who were affected by flood and implemented flood control measures
those that suffered flood damage and not implemented flood control measures
You are right.OA is A. Now agreed that before 1980 there were no floods in currently less damaged areas. But the main point/conclusion of the argument is that flood control measures are failures. Answer choice A still doesnt refute that in any way. Those who were not affected by floods might not have sough preventive measures but where measures were implemented they were a failure. So how does A attack the conclusion that preventive methods were failures.?