Which word is the preposition and which word is the object of the preposition in this sentence? 
Our car bounced and rattled loudly over the old bridge. 
A. preposition: loudly; object of the preposition: rattled 
B. preposition: and; object of the preposition: bounced 
C. preposition: our; object of the preposition: car 
D. preposition: over; object of the preposition: bridge