Select the most appropriate meaning of the given Idiom:- "To bring up the rear"

Being at the end of a queue or to lag behind others

The most appropriate meaning of the idiom "to bring up the rear" is being at the end of a queue or to lag behind others. The idiom comes from the literal meaning of bringing up the rear of a military formation, which is to be at the back of the formation. In the same way, when someone says that they are "bringing up the rear," they are saying that they are at the back of a group or that they are lagging behind others.

The other options are not as accurate. Hitting something from rear means to hit something from behind. Someone who worries less means someone who is not easily worried. None of these meanings are the same as "being at the end of a queue or to lag behind others."