If a workplace is built only on average body measurements, who may face the most difficulty?

Correct answer: Users smaller or larger than the average

Direct answer: Option A is correct. Anthropometric measurements describe differences in human body size and reach. An average is only a statistical summary; it does not fit every person. A workplace designed only for the average may be too high, too low, too narrow or too far away for people who are smaller or larger than that average. Good design usually allows adjustment or covers a suitable range of users. Option B is wrong because one average design cannot give everyone equal comfort or safety. Option C is wrong because managers are not the only affected group. Option D is wrong because visitors are not the only affected group; workers of many body sizes may be affected. The underlying principle is designing for human diversity, not assuming identical bodies. Memory cue: average is a number, not a person.