The correct answer is A — professional liability. Professional liability insurance, frequently called Errors and Omissions (E & O) coverage, addresses liability resulting from negligence, errors, omissions, or failure to provide the level of skill or professional service reasonably expected within a particular profession.

The Insurance Information Institute explains that professionals are expected to possess specialized knowledge or training and perform according to the standards of conduct applicable to their profession. When a professional fails to exercise the required degree of skill and a client suffers harm, professional liability insurance is designed to address that exposure, subject to policy terms.

Workers Compensation protects employees for qualifying employment-related injury or occupational disease; it does not insure a professional against claims alleging negligent professional services. Fiduciary liability is narrower and addresses breaches of fiduciary responsibility, particularly in connection with employee benefit plans or entrusted assets. Personal liability generally addresses nonbusiness personal activities rather than professional malpractice.

Professional liability forms are often tailored to the occupation involved. For doctors, the coverage is commonly called medical malpractice; for lawyers, accountants, consultants, architects, insurance professionals, and similar occupations, professional liability or E & O terminology is common.

The Series 17-70 curriculum requires the adjuster to distinguish specialized liability exposures as well as negligence and standards of legal responsibility.

Therefore, A is correct.