please help me on this question
multiply
(x^2-5x)(2x^2+x-3)

a.2x^4+9x^3-8x^2+15x

b.2x^4-9x^3-8x^2+15x

c.2x^4-9x^3-9X^2-15x

d.4x^4+9x^3-8x^2+15x