24. Given the following three points $(x1 = 1, y1 = 4)$, $(x2 = 2, y2 = 8)$, $(x3 = 3, y3 = 8)$, compute the best least squares fit by a linear function $y = c1 + c2x$. What is the value of $c_2$?
(A) -4;
(B) -3;
(C) -2;
(D) -1;
(E) 0; (f) 1; (g) 2; (h) 3; (i) 4.

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