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

Correct Answer: Option C — the hook load (weight of the casing string) is removed from the MODU

Landing the casing string in the wellhead transfers the entire weight of the string from the derrick to the subsea wellhead housing. This immediate transfer of load removes the hook load from the MODU, which must be accounted for in the vessel's stability and ballast calculations during operations.