单选题
The industry of producing hundreds of artificial flavors and fragrances probably appeared in ______
【正确答案】
C
【答案解析】[分析] 细节题型。
见第一段第三句：Since the early twentieth century, success in reproducing these substances has created a new industry that…符合“二十世纪早期”条件的选项只有C，所以是答案。