RCC Structures Design
Pick up the assumption for the design of a pre-stressed concrete member from the following:

A transverse plane section remains a plane after bending
During deformation limits, Hook's law is equally applicable to concrete as well as to steel
Variation of stress in reinforcement due to changes in external loading is negligible
All listed here

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RCC Structures Design
A pre-stressed concrete member is preferred because

Large size of long beams carrying large shear force need not be adopted
Its dimensions are not decided from the diagonal tensile stress
All listed here
Removal of cracks in the members due to shrinkage

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