During a tensile test on a specimen of 1 cm cross-section, maximum load observed was 8 tonnes and area of cross-section at neck was 0.5 cm2. Ultimate tensile strength of specimen is___________________?

A. none of the above

B. 22 tonnes/cm2

C. 4 tonnes/cm2

D. 8 tonnes/cm2

E. 16 tonnes/cm2

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