Correct Answer:
Option C - In the above sentence, the underlined word 'one' is a 'pronoun' because it is used instead of a noun as a subject before the modal verb 'may' 'One' is a third person singular pronoun. It is sometimes called an 'impersonal pronoun'.
C. In the above sentence, the underlined word 'one' is a 'pronoun' because it is used instead of a noun as a subject before the modal verb 'may' 'One' is a third person singular pronoun. It is sometimes called an 'impersonal pronoun'.