In the following question, three sentences are given, out of which one or more may contain a grammatical or contextual error. Identify the sentence(s) that is/are grammatically and contextually CORRECT.
A. The committee has decided to postpone the meeting until all the relevant documents are reviewed.
B. The manager was praised for his ability to handle difficult clients with patience and professional.
C. Several employees were asked to submit their reports before the deadline to avoid unnecessary delays.