According to the rational root theorem, potential rational roots must be in theform where p is a factor of the constant term and q is a factor of the leading coefficient.
B
3 is not a factor of 28, and 4 is not a factor of 6. So, does not satisfy the rational root theorem.
C
Substituting [image 1] in for x does not result in 0. The remainder is not 0 when dividing by x – [image 2]