Question

which of the following is not a valid criterion to use when evaluating a fitness center? a. free services b. supplement selection c. open hours d. health club demographics

Explanation:

When evaluating a fitness center, factors like free services (perks offered), supplement selection (on-site amenities), and open hours (accessibility) directly impact the user's experience and ability to use the facility. Health club demographics (the characteristics of other members) do not affect the functionality, quality, or accessibility of the fitness center's core offerings, so it is not a valid evaluation criterion.

Answer:

D. health club demographics