单选题:【场景】 某公路山岭隧道,长度为2000m;穿越的岩层主要是坚硬岩,岩体较完整,块状或厚层状结构;采用新奥法钻爆施工。两

题目内容:
【场景】
某公路山岭隧道,长度为2000m;穿越的岩层主要是坚硬岩,岩体较完整,块状或厚层状结构;采用新奥法钻爆施工。两洞口处由于岩层较破碎设有明洞,进口明洞长lOm,出口明洞长8m;两洞门采用端墙式洞门。根据此案例场景,回答下列问题:该隧道的围岩分级主要是(  )。 A.Ⅱ
B.Ⅲ
C.IV
D.V
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