Hi brci,
Answer Option (A) is incorrect because the author tells us in the passage of the extenuating circumstances surrounding the cakewalk. Remember, the cakewalk may have been parodied at first and become more popular because European American stage performers parodying it. But also recall that this is a Diversity passage, so it is unlikely that the author will leave it just at that. In fact, she tells us that then it became even more popular of Walker parodying the parody by "refining" and "emphasizing its fundamental grace." That is the key element necessary to parallel in this Answer (C) and why it is correct. In other words, both Answer Options (A) and (B) parallels are limited only to the initial white European parody and therefore extremely limited in their parallels making (C) the superior choice here.
Thanks for the great question!