Answer: Assurance
Step-by-step explanation:
Assurance is the factor in terms of quality service that represents reliability and surety for providing complete customer satisfaction for the work. Tracking or monitoring action, resolving issues, handling customer complaints etc are done in prominent manner so that customer does not have further issues or complaint regarding quality of service .
According to the question, professor's reply within one hour is displaying assurance quality factor that helps in maintaining , handling and fixing issue of Jonathan achieving zero marks instead of actual scores. He replied soon with solving his issue of scores and reliability on service was displayed.