Choose the sentence with the indefinite pronoun:

Words that are used as substitutes for nouns in English Grammar are called pronouns. We can make eight categories of pronouns. An indefinite pronoun is a pronoun that doesn't strictly refer to anything. A good example would be, 'There wasn't anything that could be done'. In the above options, option D is the personal pronoun as it is using 'they'. Option B is a relative pronoun as we see the pronoun is related to the noun used earlier in the sentence. Option C is simply a demonstrative pronoun. So, option A is the correct option.