A tensile test was used to test certain material. The test specimen has the following dimensions: original length $=2$ in original cross$-$sectional area $=0\mathrm{.}2$ in$^2.$ During the test the specimen yields under a load of $2000$ lb $.$ The corresponding length $=2\mathrm{.}00125$ in $.$ The strain which is associated with the yield stress will be

$($A$)6\mathrm{.}25{10}^{-2}$

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$0\mathrm{.}00125$ in

$6\mathrm{.}25{10}^{-4}$