Concept:Dead freight is the charge paid for booked cargo space on a ship that is not used.
Explanation:When a charterer books space for a full cargo but fails to load the agreed amount, the ship owner loses revenue on that unused space.
The compensation paid to the ship owner for this vacant space is known as dead freight.
It is not a penalty, nor is it dock dues collected for port services.
It also differs from demurrage, which is paid for delaying the ship beyond the agreed time.
Thus, the charge for the unused part of a ship is specifically called dead freight.
Answer:C. dead freight