Based on the novel The Lekki Headmaster, what did Mr Audu do after the MD felt deflated that she had wrongly sacked Mr Fafore?

After the MD felt deflated upon realising that she had wrongly sacked Mr. Fafore, Mr. Audu cracked a joke to lighten the mood. The MD had sided with Mr. Guta and dismissed Mr. Fafore over the grammar dispute, but when Bepo (the principal) demonstrated that Mr. Fafore's grammar was actually correct, the MD was left embarrassed and deflated by her hasty decision.

In this awkward and tense moment, Mr. Audu stepped in with humour to ease the atmosphere. His joke served to diffuse the tension and help the MD recover from the embarrassment of having fired a teacher unjustly. This use of humour in a difficult situation is a literary device that provides comic relief while also revealing Mr. Audu's social awareness and tact.

The other options do not match the novel's account. Mr. Audu did not defend Mr. Fafore's teaching methods (that was Bepo's role), propose new rules for grammar checks, or suggest a training session for staff. His specific contribution to the moment was the well-timed joke.