Final answer:
A company can offer additional health benefits to different employee classes based on job responsibilities, seniority, or compensation levels but not age, due to age discrimination laws.
Step-by-step explanation:
The company can provide additional benefits to certain classes of employees under a group health plan as long as the distinctions are not based on age. While job responsibilities, seniority, and compensation levels can be used to stratify employees for benefits, age is protected under age discrimination laws in the workplace. The various options for health insurance, including employer-based insurance and state-sponsored health exchanges under The Affordable Care Act, play a crucial role in solving adverse selection problems by pooling together a diverse mix of risk among insured individuals.