Answer:
d. A 401(k) is controlled and monitored by an employer, and an IRA is controlled by the investing individual.
Step-by-step explanation:
A 401(k) retirement plan is a plan sponsored by an employer and it allows employees to save part of their salary before the taxes are deducted.
An IRA retirement plan is an account that is used to save for retirement and it is established by a person through a broker.
According to this, the biggest difference in who controls the 401(k) and IRA retirement plans is that a 401(k) is controlled and monitored by an employer, and an IRA is controlled by the investing individual.