单项选择题

A.地膜-无纺布-无纺布-小环棚-大棚天膜
B.地膜-小环棚下层膜-无纺布-小环棚上层膜-大棚天膜
C.地膜-无纺布-小环棚下层膜-小环棚上层膜-大棚天膜
D.地膜-小环棚下层膜-小环棚上层膜-无纺布-大棚天膜