Question

Which cannot be a component of a prepositional phrase?

A: preposition
B: direct object
C: object of the preposition
D: modifier

Answer 1

No.

Explanation:

All are components of prepositional phrase!

On the table. A prepositional phrase.

See---on ==preposition
table==direct object
table is object of the preposition.
"the" is a modifier.

Answer 2

Direct object

Explanation:

Direct and indirect objects can never be part of a prepositional phrase.

In the room is a prepositional phrase.
In is the preposition, the is an article adjective and modifies the noun, room is a common noun that functions as the object of the preposition