Concept:The expression “this barbarous brawl” is Othello’s angry description of the violent street fight.
Explanation:Earlier, Cassio and Roderigo are engaged in a drunken fight.
Montano, the governor of Cyprus, tries to separate them.
In the confusion, Cassio attacks and stabs Montano.
The alarm bell rings and Othello rushes out to stop the disorder.
He sees the wounded Montano and the quarrelling men, and condemns the whole incident as a “barbarous brawl”.
He asks Iago, who appears grieved and reluctant, to identify who started the fight.
Thus, the underlined expression refers specifically to the episode in which Cassio wounds Montano.
Answer:D. Stabbing of Montano by Cassio