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（D）

(E) originating from diverse ethnic and cultural heritages and perpetuating

答案C，我选D

originated代表状态结果，originating代表动作过程。语言的多样性源于人种的多样性和文化传承——这个“源于”难道是一个持续不断的动作？