The increased popularity and availability of televisions

[netigen]

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

[chidcguy]

B is my answer.

A uses which, which is a non essential modifier and is not preceded by a comma. Almost all the time which is preceded by a comma.

Also the word perpetuated is past tense and originated is the correct form on the other side.

ing in E can be ignored for obvious reasons

What is the OA?