The phrase "a bolt from the blue" meansAA bolt of thunderBAn unexpected eventCA rare incidentDUnexpected rainAnswer: B. An unexpected event Read Explanation: This idiom refers to something that happens suddenly and without any warning.It is often used to describe surprising or shocking news or events.Therefore, An unexpected event is the correct answer.More Examples1. His sudden resignation came as a bolt from the blue.2. The unexpected announcement was a bolt from the blue.3. Her sudden arrival was a bolt from the blue. Read more in App