Ryunosuke Akutagawa's knowledge of the literatures of Europe, China and that of Japan were instrumental in his development as a writer, informing his literary style as much as the content of his fiction.
1. that of Japan were instrumental in his development as a writer, informing his literary style as much as
2. that of Japan was instrumental in his development as a writer, and it informed his literary style as well as
3. Japan was instrumental in his development as a writer, informing both his literary style and
4. Japan was instrumental in his development as a writer, as it informed his literary style as much as
5. Japan were instrumental in his development as a writer, informing both his literary style in addition to
[spoiler]OA: C[/spoiler]
1. that of Japan were instrumental in his development as a writer, informing his literary style as much as
2. that of Japan was instrumental in his development as a writer, and it informed his literary style as well as
3. Japan was instrumental in his development as a writer, informing both his literary style and
4. Japan was instrumental in his development as a writer, as it informed his literary style as much as
5. Japan were instrumental in his development as a writer, informing both his literary style in addition to
[spoiler]OA: C[/spoiler]
