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My answer is B.
Because the conclusion is generalized "saving the lives of harbor porpoises in those waters", it clearly assumes that the technique used by the fishing company to save the lives in all cases.
Lets negate B.
When disoriented, propoises are MORE likely to be killed by other boats. Then it means the lives are not being saved. But the premise that low number of propoises are caught in the company's net stil holds and it means lives are still saved. If the company had not installed the alarms then more propoises would have been killed. This means alarms are atleast saving lives of some propoises.
Now lets negate D.
The alarms were installed at the time of year when propoises were LESS plentiful. This means the low number of propoises caught in the company's net are not due to alarms and alarms are not saving life. Argument fails. _________________