根据儿童护栏检验作业指导书，外观不得有明显变形，每1米允许有（）以内的变形

A.0.5mm
B.0.8mm
C.1mm
D.1.2mm

A.50mm±0.5mm
B.50mm±1mm
C.50mm±1.5mm
D.50mm±2mm

A.±0.02mm
B.±0.03mm
C.±0.04mm
D.±0.05mm