He whirled round in a trice, with a revolver in his hand.

circle
trifle
instant
hurry

The correct answer is C. instant.

A trice is a very short time. It is often used in the phrase “in a trice,” which means “very quickly.” In the sentence “He whirled round

in a trice, with a revolver in his hand,” the word “trice” is used to describe how quickly the man turned around.

The other options are incorrect. A circle is a round shape. A trifle is a small amount of something. A hurry is a state of excitement or agitation.