It will be D by multiplying the numerator and the denominator by the unit rate of 6
I’m not sure what a natural number means, but some simple ones are
2 x 47
10 x 9.4
12 x 7
You simply multiply the two and distribute to solve. I am starting with t(x) because I think it is easier.
(x+4)*(2x^2+3x-4)
2x^3+3x^2-4x+8x^2+12x-16 (distribute)
2x^3+11x^2+8x-16 (combine like terms)