单项选择题

在Engineering Village数据库中检索植物精油(essential oil)胶囊化(capsule)技术,检索结果最少的是:()

A.("essential oil"and capsul*)wn ab
B.("essential oil"and capsul*)wn ti
C.("essential oil"and (capsul*or encapsul*)wn ab
D.("essential oil"and (capsul*or encapsul*)wn ti