Which sentence has an adjectival phrase? Becky jumped through a large hoop. The dancers on stage wore spectacular costumes. The soccer team is practicing on the field. The toy car fell off the ramp.

An adjectival phrase is nothing more than a group of words headed by an adjective. Let's remember that an adjective is a word that modifies a noun or a pronoun by giving it a quality. Among the sentences in the question, the one that contains an adjective heading an adjectival phrase is letter A. The adjective "large" modifies the noun "hoop", and together the two words form the phrase "large hoop".

As for the other sentences, they have words functioning as adjectives but that aren't really adjectives. For instance, "toy" is a noun, but in the phrase "toy car", it is modifying another noun. Still, for this reason, we cannot select any of the other sentences as the correct option for this question.