根据以下资料，回答下列各题。The use of containers, which started more than 40 years ago, in intercontinental traffic is now available in most sea cargo transport worldwide. The unit （41) is used to express the relative number of containers based on the equivalent length of a 20’ container. The （42) container service broadly means that the whole container received by the carrier is packed at the shipper’s or the forwarder’s premises, and the delivery of that same whole container to the consignees. The （43) container service broadly means that the whole container received by the carrier is packed at the shipper’s or the forwarder’s premises, and that same whole container is emptied at the carrier’s container freight station at the port of destination. The （44) broadly means that the delivery of the loose cargo to the carrier’s freight station at the port of origin is packed into the whole container, and the delivery of that same whole container to the consignees. The （45) container service broadly means that the delivery of the loose cargo to the carrier’s container freight station at the port of origin is packed into the whole container, and that same whole container is emptied at the carrier’s freight station at the port destination.
请在第41处填下正确答案。
A.30FT
B.FEU
C.TEU
D.10FT