What Was Muhammad?s Teaching with Respect to the Revelations of Other

What was Muhammad?s teaching with respect to the revelations of other monotheistic religions?

A) Muhammad accepted the earlier Christian revelations, but rejected completely any influence from Judaism.
B) Muhammad accepted the earlier Judaic revelations, but rejected completely any influence from Christianity.
C) Muhammad accepted the validity of earlier Christian and Judaic revelations and taught that his own revelations were a final refinement and reformulation of earlier ones.
D) Muhammad stressed that only his own revelations had merit and that others were works of the devil.