Which option below would allow one to use the addition method to solve the system of equations below.
2x-3y=17
5x+4y=8

a. Multiply the top equation by 4 and the bottom equation by - 3.
b. Multiply the top equation by - 5 and the bottom equation by - 2.
c. Multiply the top equation by 4 and the bottom equation by 3.
d. Multiply the top equation by 5 and the bottom equation by 2.