As per IS 456:1978, the ratio of stress in concrete to its characteristics strength at collapse in flexure for design purposes is taken as:

As per IS 456:1978, the ratio of stress in concrete to its characteris

1.	As per IS 456:1978, the ratio of stress in concrete to its characteristics strength at collapse in flexure for design purposes is taken as:
A.	0.67
B.	0.576
C.	0.447
D.	0.138
Answer» D. 0.138