The air beneath the trees is cool and still is, the revision below includes a prepositional phrase. Hence, option D is correct.
What is a prepositional phrase?
Prepositional phrases are defined as sentences that contain a preposition and either the object or complement of the preposition. These expressions mostly serve as an adjunct or a modifier to provide more specificity to the statement.
In the previous statement, "in the morning" is a prepositional phrase with the preposition "in," the word "morning" as its object, and the word "the" as its object's modifier. It serves as a modifier for the adjective "cold and still" by acting as an adverbial phrase. Because of the preposition beneath, the phrase "under the trees" is a prepositional phrase.
Thus, option D is correct.
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