The rule below shows how the weight in ounces of a kitten depends on its age in weeks. Multiply the age in weeks by 6 and then add 9. If W = weight in ounces and x = age in weeks, which equation expresses the rule above?

AW(x) = 9(x + 6)

BW(x) = 6(x + 9)

CW(x) = 6x + 9

DW(x) = 9x + 6