When she heard the knocking on the door, Nora had just awakened from a nap. She rushed into the hallway, about to answer the door. Thinking about how she looked, she glanced into the hall mirror to see if her hair was messy. It was. She rushed back to her bedroom and grabbed a hairbrush.
In the above passage, which of the following is another meaning for the word knocking?
A. Popping
B. Thundering
C. Rapping
D. Ticking