The holding capabilities of an anchor are determined PRIMARILY by the（）.

A.the amount of line paid out
B.how much the vessel sheers while at anchor
C.any change in the tautness of the anchor chain
D.changes in bearings of fixed objects onshore

A.eliminate navigational hazards by allowing the chain to lie along the harbor bottom
B.increase the anchor's reliability by providing a large catenary in the chain
C.permit the ship to maneuver in the stream while weighing anchors
D.prevent damage to the stern caused by swinging against the pier in the approach

A.facilitate speed of recovery during the weighing process
B.indicate the anchor's location to passing or mooring ships
C.prevent damage to the stern in the event of a headwind
D.provide a steady platform for the gangway between the fantail and pier