As you may already know, societies around the world of all ranges of economical power continue to have certain predetermined expectations of citizens depending on their gender, which rules out the first option. The fact that the presence and misuse of gender exists in almost every society around the world, regardless of their economical sources and development (agrarian or not), means that option D would be equally insufficient. That leaves us with options B and C, which seem to represent the arguments for and against the continuation of gender roles in modern societies. Since the structural-functional theory defends stability, both options could be use in defense of a system that creates such, or against a norm that challenges such.
