Which sentence contains an incorrect possessive form?

AHis solution took everybody's objections into account.
BSomeone's bike is in the driveway.
CIt looks as though that calf has wandered away from its mother.
DThe credit for the decorations is all hers'.

Verified Answer :

DA ' after the possessive is only used when a name ends with S

Answer:

d. The credit for the decorations is all hers'.

Explanation:

Hers does not require the apostrophe.  It is a possessive pronoun, and they are used without the apostrophe.  

Answer choices A, B, and C are good.