Concept:The alarm bell alerts Othello and draws him to the scene of the disturbance.Explanation:A brawl has broken out between Cassio and Montano.The dreadful bell is rung to raise an alarm in the island.Othello enters and immediately commands, “Silence the dreadful bell.”This shows that it is the ringing of the bell that has brought him to the scene.He then asks what the matter is and who began the quarrel.Answer:B. A bell has been rung