Choose the sentence that contains an error.

A.
My feet froze as I waited for the bus to come down my street.
B.
Before boarding the school bus, we shook the freshly fallen snow off of our boots.
C.
We flew toward the school after we left the shelter of the bus.
D.
The chill from the year's first snowfall creeped down my back, causing me to shiver.

D

Do you see why?