A bar of initial length \(\mathrm{I}_{0}\) is heated through a temperature range \(\Delta \theta\) to a new length I. The linear expansivity of the bar is ____________

A. \(\frac{1-\mathrm{lo}}{1 \Delta \theta}\)
B. \(\frac{1-1}{10 \Delta \theta}\)  
C. \(\mathrm{I}_{0}(1+\Delta \theta)\)
D. \(\frac{1-10}{1(1+\Delta \theta)}\)

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Correct Answer: B