Out of the given alternatives, choose the one which is nearest in meaning to the italicised part of the sentence.
He whirled round in a trice, with a revolver in his hand.
Italicized word ‘trice’ means quickly or in a moment. So, the best fit as the meaning of the answer is option C, ‘an instant’. Option A, ‘a circle’ means round shape. Option B ‘a trifle’ means thing with little value or importance. Option D ‘hurry’ means speed or moving quickly. Hence, the meaning of ‘trice’ is ‘an instant’, Option C.