1. To solve this problem you must apply the proccedure shown below:
2. When you multiply two polynomials, you must apply the distributive property and multiply the coefficients and add the exponents. For example:
(x)(x^2)
The coefficients of both terms are 8 and 6 and the sum of the exponents is 3 (1+2=3)
Therefore:
(8x^2)(6x)=48x^3
3. Keeping that on mind, when you multiply the polynomials shown in the figure attached, you can see that the correct answer is the option D.