(C) To calculate $204 \times 197$,we can use the algebraic identity $(x + a)(x - b) = x^2 + x(a - b) - ab$.Here,let $x = 200$,$a = 4$,and $b = 3$.$204

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(C) To calculate $204 \times 197$,we can use the algebraic identity $(x + a)(x - b) = x^2 + x(a - b) - ab$.Here,let $x = 200$,$a = 4$,and $b = 3$.$204 \times 197 = (200 + 4)(200 - 3)$$= 200^2 + 200(4 - 3) - (4 \times 3)$$= 40000 + 200(1) - 12$$= 40000 + 200 - 12$$= 40200 - 12$$= 40188$