Answer:
a.Increase more for the higher income (35% marginal tax bracket) employees.
Explanation:
As in the question it is mentioned that the United company will pay the premium of $8,000 on behalf of each employee so it would be compensated from the salary of the employee and it could be comes under the taxable income
Therefore as per the given options, the option a is correct as it would be taxed at 35% tax rate from the salaries of the employees
Therefore all the other options are incorrect