Organize the magical lost-and-found bin by choosing the right words to complete the professor's notes.

This glowing wand belongs to Luna; it is definitely hers.

The Weasley twins, however, left their flying brooms in the courtyard again.

This glowing wand belongs to Luna; it is definitely hers.

Hers is a possessive pronoun. It stands alone at the end of the clause to replace "her wand."

The Weasley twins, however, left their flying brooms in the courtyard again.

Their is a possessive adjective. It must be followed by the noun it modifies ("flying brooms").