Which of the Following Is a Difference Between Dual-Earner and Dual-Career

Which of the following is a difference between dual-earner and dual-career couples?

A) In dual-earner couples, both partners work in positions that involve ongoing professional growth whereas in dual-career couples, only one partner works in such a position.
B) In dual-career couples, both partners work in positions that require long-term commitment whereas in dual-earner couples, partners may or may not work in such positions.
C) In dual-earner couples, both partners work in managerial positions whereas in dual-career couples, both partners work in non-managerial positions.
D) In dual-career couples, partners are less qualified to perform their jobs than partners in dual-earner couples.