________ you met the foreigner from Canada?[ ]

A. Where it was that        

B. Who it was that

C. Where was it that        

D. Where was that

基础药具发放人员在帮助服务对象充分了解各种避孕措施的特性和使用方法后帮助服务对象负责任地选择适合自己的避孕措施。