If 1 and –6 are two of the roots of 6x^4 + 31 x^3 − 33x^2 − 16x + 12, then what are the other two?

A. 2 and 3/2
B. -1 and 6
C. 1/2 and -2/3
D. -2 and 2/3

(x-1)(x+6) = x^2+5x-6

6x^4+31x^3-33x^2-16x+12
-----------------------------
x^2+5x-6

= 6x^2+x-2 = (3x+2)(2x-1)

so, (C)