The ACSM American Fitness Index (AFI) is a (an):
A. Initiative for individuals to self-screen their own fitness levels
B. Self-test that clients use to rate their fitness relative to others in their age group.
C. Screening tool used by Personal Trainers to stratify clients into cardiovascular risk categories.
D. Program to help cities understand how their residents' health compares to other cities nationwide.
Answer: D