Выберите один из нескольких вариантов Ihr habt einen Ball. Das ist ... Ball.

The sentence is in German. The first part "Ihr habt einen Ball" translates to "You have a ball". The second part "Das ist ... Ball." needs a possessive pronoun to complete the sentence. Since "Ihr" is plural "you", the correct possessive pronoun is "euer" (your). Therefore, the complete sentence is "Das ist euer Ball." which means "That is your ball.".