Liner freight rates are fixed by liner operators. They are related more to the cos

ts of operation and which remain comparatively steady over a period of time. The liner rates are also subject to surcharges or adjustment factors which may be levied from time to time in order to enable the shipping lines to meet certain price variations in their inputs such as （）, the bunker adjustment factor and port congestion surcharges.

A．currency adjustment factor

B．crew adjustment factor

C．water adjustment factor

D．administrative adjustment factor