谁能提供一下解体思路

hedgeforfun

15.    The increased popularity and availability of televisions has led to the decline of regional dialects, language variations which originate from diverse ethnic and cultural heritages and perpetuated by geographic isolation.
(A) which originate from diverse ethnic and cultural heritages and perpetuated
(B) that originated from diverse ethnic and cultural heritages and perpetuated
(C) originated from diverse ethnic and cultural heritages and perpetuated
(D) originating from diverse ethnic and cultural heritages and perpetuated
(E) originating from diverse ethnic and cultural heritages and perpetuating
看不太懂,不知怎么入手
选d,是怎么来的?

kathy72

分词作定语修饰variations, 考平行结构.
originating 和 perpetuated 并列, 一个表主动, 一个表被动.

hedgeforfun

谢!