What Does the RAND HMO Experiment Conclude About the Differences

What does the RAND HMO experiment conclude about the differences in FFS and HMO hospital admissions?

A) HMOs are more risk selective than FFS
B) HMOs are less risk selective than FFS
C) HMOs provide a better incentive to reduce admission rates than FFS
D) HMOs provide a better incentive to increase admission rates than FFS.