At the instant when a string of casing being run from a MODU is landed in the well head, ___________________.

A
the total weight in air of the casing string is removed from the MODU
B
the hook load (weight of the casing string) is removed from the MODU
C
the weight of the casing inside the riser is removed from the MODU
D
the weight of the casing string added to the weight of the fill-up mud is removed from the MODU
E