单项选择题
The preventer guy，as used on a conventional yard and stay rig，（）.
A.is rigged at an angle of 70°to 90°from the guy it assists
B.takes the strain imposed on the schooner guy when burtoning cargo
C.is rigged when lifting cargo that exceeds the SWL of a single whip
D.should take the strain if the regular guy parts
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