Question

Which sentence contains an introductory adverb phrase that is incorrectly punctuated?
a. with his trademark firm handshake, my father congratulated me.
b. during the test drive, the car nearly veered off the road.
c. for at least three hours melissa has been singing the same song.
d. at the mountain's peak, the abandoned wooden cabin slowly rotted away.

Answer 1

All of them because they don't have capital letters at the start.

Joking apart, the real answer is C, because it doesn't have a comma. It should read "For at least three hours, Melissa has been singing the same song.