The correct answer is A.
The statement that best summarizes the author's ideas is:
" The differences between men and women allow them to balance one another, and they should be considered as equal as they are in nature. "
The author explains that men and women are, indeed, different, and that because of that, they complement one another. However, the author supports the idea that, just because they are different in some aspects, it doesn't mean that men and women should not be treated equally since "the male and female tree and vine and shrub rejoice in the same sunshine and shade".