What material may be substituted for zinc when making a poured metal socket ending to a wire rope（）.

A.To act as ballast for light vessels
B.To provide ventilation and drainage for cargo
C.To secure the tarpaulins in place
D.To support weakened bulkheads

A.Chain to chain connections
B.Chain to anchor connections
C.Kenter link to anchor connections
D.Wire rope connections

A.Downhaul
B.Backstay
C.Halyard
D.Sheet