The correct pronoun to be used in the grammatically correct sentence will be, 'My colleagues are as happy as I.' Hence, option A holds true.
What is a pronoun?
A word or a phrase that can be used in the place of a noun in order to maintain the fluency and grammatical correctness of the sentence, is known as a pronoun.
In the sentence given above, 'my' is the noun form of the word in the sentence, thus the pronoun that appropriately fits the sentence will be 'I'.
Hence, option A holds true regarding a pronoun.
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