The Arts and Crafts movement of the late nineteenth century strove to (revitalizing) handicrafts and applied arts (during) an (era of) increasing (mass production).
ANSWER: C
the era를 해줘야 하는건가요? 왜 그런건가요?
of 앞에 명사에는 무조건 the를 붙여야 되는건가요? 명쾌한 답변 부탁드립니다. ^^