Which words in the sentence make up the prepositional phrase? my mother hummed a tune as she put the cookies into the oven. a. as she put b. into the oven c. hummed a tune d. my mother

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Which words in the sentence make up the prepositional phrase? My mother hummed a tune as she put the cookies into the oven.

Prepositional phrase- a modifying phrase consisting of a preposition and object 

Example.
We climbed up the hill.

 B. into the oven