1l8. The question of whether to divest themselves of stock in companies that do business in South Africa is particularly troublesome for the nation’s 116 private Black colleges because their economic bases are often more fragile than most predominantly White colleges.

(A) than

(B) than those of

(C) than is so of

(D) compared to（B）

(E) compared to those of

这题选B我没有问题，我的疑问是句中的predominantly修饰谁，又如何翻译呢？请NN们指点，谢了！

predominantly 修饰white,than 后面可以翻译为，大多数白人为主的大学。

请看longman上的例句：

As a civil engineer, Susan will be competing in a predominantly male profession.