Final answer:
The Mogadorians' can't harm the female Number whose location they know due to societal discrimination and the power dynamics between men and women.
Step-by-step explanation:
The reason why the Mogadorians' can't harm the female Number whose location they know is because of the power balance between men and women. In the provided texts, it is evident that there is a societal divide and discrimination against women. It is mentioned that women are confined to the zenanas, which are women's quarters, and are kept separate from men.
Furthermore, it is shown that women are considered weaker in comparison to men. However, the conversation between the characters Sara and the narrator suggests that women have the capability to make an impact beyond their physical strength. The narrator questions whether putting men inside the zenana and confining them to the four walls would really solve all the business, political, and commercial matters. This implies that women should be given equal opportunities to contribute to society and that their strength lies beyond physical dominance.
The primary topic of this question is the power dynamics and discrimination against women in society.