Answer:
a: A pronoun can be used as the subject of a verb.
Step-by-step explanation:
The nominative case is used for the subject of a verb. For example, in the sentence "She is singing," "she" is the subject and is in the nominative case. "She" is a pronoun, and pronouns can be used as the subject of a verb in the nominative case.
Option b: "A pronoun can be used as the preposition of a verb" is incorrect. A preposition is a word that shows the relationship between a noun or pronoun and another word in a sentence, such as "in," "on," or "under." Pronouns cannot be used as prepositions.
Option c: "A pronoun comes before a noun to show ownership" is also incorrect. In English, possession is usually shown with the possessive case, which is formed by adding an apostrophe and the letter "s" to a noun or pronoun, such as "my" or "her." Pronouns in the possessive case do not come before a noun to show possession.