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【单选题】
在标准耐火试验条件下，对一墙体进行耐火极限试验，试验记录显示，该墙体在受火作用至 0.50h 时粉刷层开始脱落，受火作用至 1.00h 时被火面的温度超过规定值，受火作用至 1.20h 时出现了穿透裂缝，受火作用至 1.50h 时前提开始垮塌。该墙体的耐火极限是（ ）h。A.
1.0
B.
0.5
C.
1.2
D.
1.5
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