According to the Rational Root Theorem, negative 7 eighths is a potential rational root of which function?
A
f of x is equal to 56 x to the 7th power plus 3 x to the 6th power plus 4 x cubed minus x minus 30B
f of x is equal to 28 x to the 7th power plus 3 x to the 6th power plus 4 x cubed minus x minus 24C
f of x is equal to 30 x to the 7th power plus 3 x to the 6th power plus 4 x cubed minus x minus 56D
f of x is equal to 24 x to the 7th power plus 3 x to the 6th power plus 4 x cubed minus x minus 28