Sentence Correction

With its plan to create a wildlife sanctuary out of a previously unused landfill, Sweden is but one of the number of industrialized nations that is accepting its responsibility to protect endangered species and promote conservation

A. is accepting its responsibility to protect endangered species and promote
B. is accepting its responsibility for protecting endangered species and promoting
C. are accepting its responsibility to protect endangered species and promoting
D. are accepting of their responsibility to protect endangered species and to promote
E. are accepting their responsibility to protect endangered species and promote

Correct Answer : E


Can someone please explain this.

Thanks