What is NOT an advantage of the house-fall system when compared to a married-fall system using two of the ship's booms?

A
There is a steady spotting area under the dockside block.
B
Loading can be accomplished from a narrow apron without endangering the inboard boom.
C
The system can be used for working the second deck of a warehouse.
D
There is more accurate control of cargo drafts required to be stowed in the wings.
E