987-379 A OF B that到底修饰A还是B？

379.                  n good years, the patchwork of green fields that surround the San Joaquin Valley town bustles with farm workers, many of them in the area just for the season.

(A) surround the San Joaquin Valley town bustles with farm workers, many of them

(B) surrounds the San Joaquin Valley town bustles with farm workers, many of whom are

(C) surround the San Joaquin Valley town bustles with farm workers, many of who are

(D) surround the San Joaquin Valley town bustle with farm workers, many of which（A）

(E) surrounds the San Joaquin Valley town bustles with farm workers, many are

这题为何要跟surround 而不是surrounds ？A OF B结构中心词不是A吗？不应该修饰A吗？

根据逻辑意思来决定.  不能绝对化.