Final answer:
The central idea supports the controlling idea by emphasizing the mutual benefits of equal education for both men and women.
Step-by-step explanation:
The central idea, 'Giving women rights will help both men and women', supports the overall argument expressed in the controlling idea, 'Both men and women must be educated in order to have the same knowledge', by establishing the idea that women are not the only ones who benefit from equal education. This is illustrated by showing how men can also have improved education through the empowerment of women. By highlighting the mutual benefits of educating both genders, the central idea strengthens the argument that equal education is essential for both men and women.
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