The correct answer is A. polling.
Polling is the process of periodically checking the status of a device or system to see if it needs attention. In the context of the question, the processor is constantly checking the status flags to see if any of them have been set. If a flag is set, it indicates that an event has occurred that requires the processor to take action.
B. Inspection is the process of closely examining something to find out its condition or to identify any problems. C. Reviewing is the process of looking at something again, especially in order to check it or to make changes. D. Echoing is the process of repeating something that has been said or written.
In the context of the question, inspection, reviewing, and echoing are not appropriate terms to describe the process of the processor constantly checking the status flags.