Mr. Brown arranged for the taxi to come at six _____ she would not have to wait long at the station. [ ]

A. so that

B. even if

C. before

D. because

根据产品生命周期理论，产品成熟期应选择（）

A.海外直接投资战略

B.商品出口战略

C.技术转让战略

D.海外间接投资战略