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Sir Martin Frobisher, the English explorer, was the first European to explore (1576–78) the eastern approaches of the passage. John Davis also explored (1585–87) this area, and in 1610 Henry Hudson sailed north and visited Hudson Bay while seeking a short route to Asia.
I am unable to see the exact choices you are supplied with, but frank refers to saying or establishing something sincerely and bluntly.
Not so sure im really trying to remember :(