A smooth，tapered pin，usually of wood，used to open up the strands of a rope for splicing is called a(n)（）.

A.decreases the size of the line
B.should be used if the line is going through a block
C.should only be used in wire rope
D.doubles the size of the line

A.hoisting a windsail
B.parcelling
C.sewing canvas
D.testing canvas

A.make a temporary eye
B.mouse a hook
C.secure a line around a spar
D.shorten a line