Sentence Correction

(This problem was an example in the notes:)

I was wondering if "Life-Styles" is plural, and if it is, shouldn't the correct answer have "seem" instead of "seems"

In a crowded, acquisitive world, the disapperance of lifestyles such as those once followed by southern Africa's Bushmen and Australia's aborigines, requiring vast wild spaces and permitting little accumulation of goods, seem inevitably doomed.

(B) requiring vast wild spaces and permitting little accumulation of goods, seems to be inevitably doomed
(C) which require vast wild spaces and permit little accumulation of goods, seems to be inevitably doomed
(D) life-styles that require vast wild spaces and permit little accumulation of goods, seem inevitable
(E) life-stlyes requiring vast wild spaces and permitting little accumulation of goods, seems inevitable

E is the correct answer.

its not referring the "life style" ,it is referring "disappearance of lifestyle."