All of the Following Situations Are Passive Modes of Penetration

Multiple Choice

All of the following situations are passive modes of penetration for the invasion of host tissues by opportunistic pathogens EXCEPT

A) a child falling and scraping her knee.
B) a firefighter receiving third-degree burns on the skin.
C) a hiker being bitten by a tick.
D) a bacterium adhering to intravenous tubing,forming a biofilm.