(B) To calculate $85 \times 75$,we can use the algebraic identity $(a - b)(a + b) = a^2 - b^2$.We can write $85$ as $(80 + 5)$ and $75$ as $(80 - 5)$.

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(B) To calculate $85 \times 75$,we can use the algebraic identity $(a - b)(a + b) = a^2 - b^2$.We can write $85$ as $(80 + 5)$ and $75$ as $(80 - 5)$.Thus,$85 \times 75 = (80 + 5)(80 - 5)$.Using the identity $a^2 - b^2$,where $a = 80$ and $b = 5$:$= 80^2 - 5^2$$= 6400 - 25$$= 6375$.