If C is creep coefficient, f is original pre-stress in concrete, m is modular ratio, E is Youngs modulus of steel and e is shrinkage strain, the combined effect of creep and shrinkage is________________?

A. (1 C)mf + eE

B. (1 C) mf eE

C. (C 1)mf eE

D. (C 1)mf + eE
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