求助，36套中第32套的第10题

innerpeace.donUID: 3340602

question：
Of the following sentences, which is most likely to
have immediately preceded the passage?

The answer is B:
Spirituals and Black gospel music were derived
from the same musical tradition.

But I think the answer should be D:
Spirituals and gospel music can be clearly
distinguished from one another.

Because the first sentence of this passage is "This is not to deny that the Black gospel music of the early twentieth century differed in important ways from the slave spirituals.", which, apparently, implies that the immediate preceding text should state the two kinds of music are seemingly different. However, why the answer is B rather than D?
Hope some warm persons to explain the answer. Thank you!