The prepositional phrase in this sentence is c. "to your sentence structure", because it is postmodifying an infinitive phrase (to bring complexity), which has the same value, in this case, as a noun phrase. Besides it is composed by a preposition (to) and a noun phrase (your sentence structure).
Option a. is a verb phrase as well as option b. In the same way, letter d. is not a prepositional phrase as it is an adjective phrase used in the comparative form.
Answer: C
Explanation:
A: The boy wanted to get ice cream, and he did. He should be completely happy with that. No problem in sigh
B: Nothing is preventing Ryan from cooking
C: Julie wanted to, but she couldn't. That's a problem
D: Same as A. She wanted to go, so she did. Everyone's happy
Answer:
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Explanation: