A Major Factor Contributing to the Growth in Employee-Based Health

A major factor contributing to the growth in employee-based health insurance in the United States has been

A) greater than average economic growth leading to increased demand for labor.
B) the tax free treatment of health insurance as an employee benefit.
C) legislation requiring all firms to provide health insurance to all full-time workers.
D) the long standing tradition in the United States of providing a generous package of benefits to all workers.