Final answer:
Professional liability insurance, also known as errors and omissions insurance, would cover a case where defamation of character resulted in a loss of clientele and revenue.
Step-by-step explanation:
The type of insurance that would cover a case where defamation of character resulted in a loss of clientele and revenue is professional liability insurance.
This type of insurance, also known as errors and omissions insurance, provides coverage for professionals such as doctors, lawyers, and consultants. It protects against claims of negligence, including defamation, made by clients or third parties. In the case of a loss of clientele and revenue due to defamation, professional liability insurance would help cover legal expenses, settlements, and any resulting financial damages.