Concept:The calculation of probability of risk in insurance is done by a specialist in risk measurement.
Explanation:An actuary is a professional who specializes in measuring and managing risk and uncertainty.
In insurance, actuaries use mathematics and statistics to calculate the probability of events such as accidents, illness, or death.
These calculations help insurance companies set premiums and reserves accurately.
This role is different from an underwriter, who evaluates and accepts risks, or a broker, who arranges insurance for clients.
Answer:A. an actuary