after reviewing the additional development request (ADR) response, the MAC totally denied the claim. /which is the least likely reason for the claim to be denied?

A) lack of documentation to support the MDS and/or the level of care

B) inaccurate or missing information on the UB-04

C) the physician's certification is not signed and dated by the MD, NP, PA, or CNS

D) she did not make any progress for the three days during the claim period