Question

complete the sentence with the best relative pronoun. on saturday, damon is throwing a big party with eliana, birthday he shares.

Explanation:

To determine the correct relative pronoun, we analyze the sentence structure. The blank is used to show possession (the birthday that Damon and Eliana share, so it's Eliana's birthday). The relative pronoun "whose" is used to indicate possession in relative clauses. It connects the noun "Eliana" to the noun "birthday" to show that the birthday belongs to Eliana.

Answer:

whose