Answer:
The sentence in which the prepositional phrase best modifies the verb call is D) Angie said she would call Jen in the morning.
Step-by-step explanation:
This is the only sentence where the prepositional phrase "in the morning" actually modifies the verb call by showing the moment in which Angie would call. The rest of the options do not detail the moment when Angie would call, but the one when she said she would call, because the prepositional phrase is modifying the verb say.