E is the answer.
This conclusion is: CPUE number same -> shark numbers are same
To weakedn the conclusion, we need to establish that the way to reach CPUE somehow has changed since 1973.
This question defines the CPUE carefully.
E is the only answer that could address catches 'per hour' and the other answers are not relevant.
E: (Technology improvement -> sharks still easy to find EVEN THOUGH numbers have dropped -> maybe shark numbers not equal)
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