The sentence given in option (a) is erroneous. In that sentence, the possessive pronoun 'hers' is used in place of a possessive adjective/determiner 'her', which makes the sentence incorrect. Possessive pronouns are not followed by the noun, they replace nouns but possessive determiners are followed by the nouns. Hence, 'hers' is incorrect here and must be replaced with 'her'.
Hence, the correct answer is option (a).
Note:
Possessive Pronouns: The pronouns mine, yours, hers, his, ours, and theirs are known as possessive pronouns: they refer to something owned by the speaker or by someone or something previously mentioned. For example: The pen is mine.
Possessive Determiners/Adjectives: Words like 'my', 'our', 'your', 'his', 'her', 'its', and 'their' are known as possessive adjectives (or possessive determiners). They come before nouns and indicate ownership of the noun. Example: "The teacher asked the students to open their drawing books."
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