In prestressed concrete______________?

A. forces of tension and compression change but lever arm remains unchanged
B. forces of tension and compressions remain unchanged but lever arm changes with the moment
C. both forces of tension and compres-sion as well as lever arm change
D. both forces of tension and compres-sion as well as lever arm remain unchanged

Select the correct statement?

A. Elastic modulus of high tensile steel is nearly the same as that of mild steel
B. Elastic modulus of high tensile steel is more than that of mild steel
C. Carbon percentage in high carbon steel is less than that in mild steel
D. High tensile steel is cheaper than mild steel

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