compare 9 X 10^4 and 5 X 10^3

A. 5 X 10^3 is 4 times larger than 9 X 10^4

B. 9 X 10^4 is 18 times larger than 5 X 10^3

C. 9 X 10^4 is 8 times larger than 5 X 10^3

D. 9 X 10^4 is 5 times larger than 5 X 10^3


I know that 9 X 10^4 is larger but I don't know how much larger. Plz help....