I believe the best answer for this question would be D, "archetype." A femme fatale is a character who appears in many works of literature, although she takes on different forms. She possesses many of the same qualities and performs largely the same actions, making her an archetype. She may or may not be symbolic, solitary, or heroic, which means you can rule these options out as your answer because they are not definitive. Other examples of archetypes are the hero, the wicked witch, the wise old man, etc. Hope this helps.
Okonkwo's thinking and compression about femininity and the way he interacts and lives with women is not much different, as he has a strong opinion about it and believes that women should act in the way his concepts were settled down. In the same way, he believes that femininity is what he has established in his thinking and believes that it is right.
For Okonkwo, femininity imposes that those who have it are weak, inferior, childish, emotional, unable to be independent and mentally inefficient. Women are the greatest holders of femininity, so for Okonkwo all women (and men with characteristics that he considered female) should live in a submissive way and do what men, full of masculinity, believed that should be done.