Final answer:
An egalitarian family structure is one where both parents share both nurturing and providing roles, breaking away from traditional gender roles.
Step-by-step explanation:
The type of division of labor in families referred to as a "dual-nurturer" family is A. Egalitarian. In an egalitarian family structure, both parents share the roles of providing financial support and caring for the children, rather than following the traditional gendered division of labor where men typically assume the instrumental roles and women assume the expressive roles. The egalitarian model promotes a more balanced responsibility in child-rearing and household duties, allowing both parents to be equally involved in nurturing and providing for the family.