A 49-Year-Old Male Has Been Stabbed in the Lower Right

A 49-year-old male has been stabbed in the lower right chest. Police tell you that the patient got into an argument with an unidentified man, who then stabbed him before fleeing the scene. After assessing the patient, you are suspicious that the knife punctured the lung and is causing internal bleeding. In this situation, the mechanism of injury would be:

A) stab wound to the right chest.
B) assailant with a knife.
C) penetrating trauma to the lungs.
D) internal hemorrhage.