By application of tensile force, the cross sectional area of bar P is first reduced by 30% and then by an additional 20%. Another bar Q of the same material is reduced in cross sectional area by 50% in a single step by applying tensile force. After deformation, the true strain in bar P and bar Q will, respectively be

• A. 0.5 and 0.5
• B. 0.58 and 0.69
• C. 0.69 and 0.69
• D. 0.78 and 1.00