The part of the sentence that is a prepositional phrase is "over the mantelpiece"
What is a Prepositional Phrase?
This refers to the collection of words that contains a preposition, an object (receiver of the action), and modifying words.
Hence, we can see that from the given sentence, there is the use of words to show the old painting and how it hung over the mantelpiece and the prepositional phrase is "over the mantelpiece" and the subject it affects is "the mantelpiece"
Read more about prepositional phrases here:
https://brainly.com/question/1841317
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