Final answer:
The sentence B contains a prepositional phrase 'Wherever Sandra went', serving as an adverbial description of the places where Sandra practices her dancing skills.
Step-by-step explanation:
The sentence that contains a prepositional phrase is:
B. Wherever Sandra went, she would practice her dancing skills.
The prepositional phrase in this sentence is 'Wherever Sandra went', which starts with the preposition 'wherever' and includes a noun 'Sandra'. Prepositional phrases can act as adverbials, and in this case, it describes the places where Sandra practices her dancing skills. Avoiding the passive voice, this sentence actively describes an ongoing action with Sandra as the subject directly practicing her skills.