Select the most appropriate meaning of the given Idiom:-

"Coming of a bolt out of the blue  "

Occurrence of something unexpectedly

The most appropriate meaning of the idiom "coming of a bolt out of the blue" is occurrence of something unexpectedly. The idiom comes from the literal meaning of a bolt of lightning, which can strike without warning. In the same way, when something happens "like a bolt out of the blue," it is unexpected and surprising.

The other options are not as accurate. Shooting someone from long distance is not an idiom, and it does not mean to happen unexpectedly. Hitting a fast moving vehicle by an iron bolt is not an idiom either, and it does not mean to happen unexpectedly. Coming out of deep waters is not an idiom either, and it does not mean to happen unexpectedly.