The correct answer is C. The cookies smell quite delicious. (Underlined // quite delicious)
Step-by-step explanation:
In grammar, an adjective phrase refers to a set of words that contain at least one adjective and modify or describe a noun in the sentence which is usually mentioned right before or after the adjective phrase. Additionally, adjective phrases are key in sentences because they provide necessary details that allow the reader to understand an idea.
From the pitons given the one that contains an adjective phrase is "The cookies smell quite delicious" because in this the underlined words "quite delicious" act s an adjective by describing the smell of the cookies. Also in other options such as "I made a German chocolate cake for my grandfather's birthday," the phrase is a noun phrase or other types of phrases but not adjective ones.