A. proletariat; the latter of which, he wrote, was free from the danger of moral decay due to their lack of
B. proletariat, which, he wrote, were free from the danger of moral decay due to their lack of
C. proletariat; the latter, he wrote, was free from the danger of moral decay because of its lack of
D. proletariat, the latter of which he wrote were free from the danger of moral decay because of lacking
E. proletariat, the latter being free, he wrote, from the danger of moral decay because of lacking
The correct answer is 'C'
My learning till I encountered this question was that 'because of' should follow a NOUN and I found this explanation in a blog of another test prep company (mag....) , and just because of 'because of'

Any support will be appreciated.
Thanks.