In a doubly-reinforced beam if and the effective depth and is depth of critical neutral axis, the following relationship holds good______________?

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In a doubly-reinforced beam if and the effective depth and is depth of critical neutral axis, the following relationship holds good______________?

A. mc/t = n/(d – n)(Correct)
B. (m + c)/t = n/(d + n)
C. (t + c)/n = (d + n)/n
D. mc/t = (d – n)/t