Hold on guys, "C" for #2...how can we explain the number decreasing for the survey vessels, yes we can explain abt the commercial vessel, but stem says that number decreases by the same amt for survey vessels, how can we explain this using C....don't see how C can be the OA ? Anyone ?
The question asks what is most helpful to account for the discrepency. C only accounted one side, and not the other side of the story. But the others are not helpful at all. So C is the most helpful one.