Question

which key advantage is part of a roth ira?
contributions are tax - deductible
employers make contributions on behalf of employees
earnings grow tax - free, and qualified withdrawals are tax - free
there are no income limits for contributions

Explanation:

A Roth IRA has the key advantage that earnings grow tax - free and qualified withdrawals are tax - free. Contributions to a Roth IRA are not tax - deductible, employers don't make contributions on behalf of employees for Roth IRAs, and there are income limits for contributions.

Answer:

Earnings grow tax - free, and qualified withdrawals are tax - free