Which sentence has no errors in punctuation?

a. a large, branch of the tree scraped against the window and made a creepy eerie sound.

b. i bought a denim skirt, a pair of jeans, and a vase for my mom at the thrift store today.

c. in the back of the car, was a small shopping bag that i think caroline left behind.

d. the audition was nerve-racking but i think i have a good chance of getting the part, in the play.