Identify the kind of adverb used in the sentence:
She has been to Agra twice.
The adverb in the given sentence is ‘twice’. It is an adverb of frequency that tells us how often the action takes place, i.e. the rate of occurrence. Therefore option C is correct. Whereas an adverb of place will tell you where the action happens or where someone is going, for example ‘outside’ or ‘upstairs’. An adverb of time tells when the action happened, like ‘tomorrow’ or ‘next year’. While an adverb of manner explains the way people do things, like ‘skilfully’ or ‘correctly’. Since the given adverb denotes how many times the person has visited Agra, options A, B and D are incorrect.