Final answer:
Noncompliance with wellness programs
Step-by-step explanation:
A valid reason for an enrollee to be cancelled by a Health Maintenance Organization (HMO) plan is B. Noncompliance with wellness programs.
HMOs often have wellness programs in place to encourage members to adopt healthy habits and participate in preventive care. If an enrollee fails to comply with these programs, the HMO may cancel their enrollment.