Which one is a prepositional phrase from the following sentence? My experiences as a freshman has been a positive one so far.

Ineed . the passage implies that: a. most jury trials involve violent crimes b. jurors may be surprised by how stressful being in a jury is c. a trial by jury is not a fair way to judge a person’s guilt or innocence d. the people who take jury duty least seriously are the ones who find xperience most stressful