Charcoal-containing wound dressings may be beneficial for patients with pressure ulcers because:

A. unlike other synthetic dressings, charcoal dressings can be used in combination with a moisture barrier.
B. these dressings can assist in odor control.
C. these dressings stay in place better than other dressings.
D. unlike other synthetic dressings, charcoal dressings do not contain cytotoxic agents.

B