Answer:
C. all real numbers except 3/4
Explanation:
f(x) and g(x) are both defined for all real numbers. However, the ratio f/g will be undefined where g(x) = 0. That occurs when ...
4x -3 = 0
4x = 3 . . . . . add 3
x = 3/4 . . . . . divide by 4
The value of x = 3/4 makes f/g undefined, so must be excluded from the domain.