Answer:
b. The credit for the decorations is all hers'.
Explanation:
The correct possessive pronoun would be hers.
You don't need the apostrophe (') with possessive pronouns.
Possessive pronouns are <em>mine; yours (singular); his; hers; its; ours; yours (plural); theirs. </em>They are all used <u>without</u> the apostrophe (').
C
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