Which polynomial function has the most roots?
a. g(m) = 158m2
b. f(x) = x12 – 1
c. g(n) = 2n3 + 3n6
d. f(a) = 15a4 + a3 –3a2

Total Number of Roots. On the page Fundamental Theorem of Algebra we explain that a polynomial will have exactly as many roots as its degree (the degree is the highest exponent of the polynomial). So we know one more thing: the degree is 5 so there are 5 roots in total.
since the the highest degree is 12 from x12 - 1, so the answer is B