Final answer:
The answer is D) Accusation of a contagious disease.
Step-by-step explanation:
The answer is D) Accusation of a contagious disease. Among the options given, accusing someone of a serious crime, making a false statement that harms their reputation, and accusing them of professional incompetence can all be considered slander per se. Slander per se refers to false statements that are inherently damaging to someone's reputation, without the need for additional proof of harm. However, accusing someone of a contagious disease would not necessarily fall under slander per se, as it may not inherently harm their reputation or character.