(B) The given expression is in the form $\frac{a^{2}-b^{2}}{a-b}$.Using the algebraic identity $a^{2}-b^{2} = (a-b)(a+b)$,we can simplify the expressi

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(B) The given expression is in the form $\frac{a^{2}-b^{2}}{a-b}$.Using the algebraic identity $a^{2}-b^{2} = (a-b)(a+b)$,we can simplify the expression as follows:$\frac{(a-b)(a+b)}{a-b} = a+b$.Here,$a = 2.39$ and $b = 1.61$.Substituting these values,we get:$a + b = 2.39 + 1.61 = 4.00$.Therefore,the value of the expression is $4$.