If C is creep coefficient, f is original prestress in concrete, m is modular ratio, E is Young's modulus of steel and e is shrinkage strain, the combined effect of creep and shrinkage is:

If C is creep coefficient, f is original prestress in concrete, m is m

1.	If C is creep coefficient, f is original prestress in concrete, m is modular ratio, E is Young's modulus of steel and e is shrinkage strain, the combined effect of creep and shrinkage is:
A.	<i>(1 - C)mf - eE</i>
B.	<i>(C - 1)mf + eE</i>
C.	<i>(C - 1)mf - eE</i>
D.	<i>(1 - C)mf + eE</i>
Answer» C. <i>(C - 1)mf - eE</i>