(C) To evaluate $77 \times 83$,we can use the algebraic identity $(a - b)(a + b) = a^2 - b^2$.We can write $77$ as $(80 - 3)$ and $83$ as $(80 + 3)$.S

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(C) To evaluate $77 \times 83$,we can use the algebraic identity $(a - b)(a + b) = a^2 - b^2$.We can write $77$ as $(80 - 3)$ and $83$ as $(80 + 3)$.Substituting these into the identity:$77 \times 83 = (80 - 3)(80 + 3)$$= 80^2 - 3^2$$= 6400 - 9$$= 6391$.