prep08语法题求助（B of A和A's B的差异）

小炎炎

201. (GWD30-Q4)
The three women, liberal activists who strongly support legislation in favor of civil rights and environmental protection, have consistently received labor's unqualifying support.  
A. have consistently received labor's unqualifying support
B. are consistently receiving the unqualifying support of labor
C. have consistently received the unqualified support of labor
D. receive consistent and unqualified support by labor     
E. are receiving consistent and unqualified support by labor
答案：C

我的问题是labor's unqualified support为什么比unqualified support要优？

语法笔记上写的是
“N’s n或n of N，都可以，能表达清楚意思又简 洁的为上，这里labor’s后面已经有一个unqualified这种不是专门为了组成名词短语而存在的形容词（如 vocal tract）了，所以还是用n of N比较清晰。 ”
像是会出现歧义的样子，但是我没明白歧义在哪里。

梦季

看一下！