Answer:
B pronoun (?)
Step-by-step explanation:
I'm not certain of this but here's my two cents;
Definition
"A prepositional phrase consists of a preposition, its object, and any words that modify the object"
or
"A prepositional phrase is a group of words that begins with a preposition and ends with a noun, pronoun, or noun phrase"
I say am unsure because "he" when referring to Jesus is usually capitalized, and the wording of the question isn't completely clear,
the preposition 'in' modifies 'Him', and 'Him' is a pronoun. So-- B is the reasonable answer, I hope this helps!