Which of the following would be an example of disease transmission via indirect contact?
A. Mr. Smith sneezes on an airplane, and the person sitting beside him catches his cold.
B. A restaurant worker has diarrhea caused by Norovirus. He fails to wash his hands adequately before preparing the salad, and his customers get sick.
C. A student sneezes on her test booklet. The instructor grades it and catches her cold.
D. A tick that is infected with Lyme disease bites a hiker, and the hiker gets Lyme disease.