For the Pair of Functions, Find the Product $(f g)(x)$
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Multiple Choice

For the pair of functions, find the product $(f g) (x)$ .
- $f(x) =4 x+2, g(x) =x^{2}+6 x-8$

A) $5 x^{3}+28 x^{2}+20 x-15$
B) $4 x^{3}+26 x^{2}-20 x-16$
C) $x^{3}-26 x^{2}-26 x-19$
D) $x^{2}-10 x+6$