The prepositional phrase in the sentence "Either you must stop eating my food from the refrigerator or you must pay me for it." is A. "from the refrigerator"
A prepositional phrase is a phrase that consists of a preposition and an object which is linked to the object. A preposition is a word that usually governs or precedes a noun. An object is a noun that comes after the subject and the verb. A simple example of a sentence that includes a subject, verb and object is:
The cat sat on the mat.
"The cat" is the subject."sat" is the verb and the prepositional phrase that includes the object is "on the mat"