What type of punctuation mark is used to set off words that add details in the middle of a sentence?

In order really to hate white people, one has to blot so much out of the mind — and the heart — that this hatred itself becomes an exhausting and self-destructive pose. but this does not mean, on the other hand, that love comes easily: the white world is too powerful, too complacent, too ready with gratuitous humiliation, and, above all, too ignorant and too innocent for that. which sentence best explains how the use of parallelism in the excerpt supports baldwin's purpose? a. it proves baldwin's central idea by highlighting the obvious. b. it emphasizes the problems that prevent one from loving the white world. c. it explains why the white world is unable to replace hate with love. d. it enumerates the many ways of dealing with the white world.