Final answer:
The parent function of f(x) = 18x - 4a is a Linear Function.
Step-by-step explanation:
The parent function of f(x) = 18x - 4a can be determined by analyzing the form of the equation.
The function is a linear equation since it has a power of 1 (x has a power of 1) and a constant term (-4a).
Therefore, the correct option is a. Linear Function.
The parent function of f(x) = 18x - 4a is y = mx + b, where m represents the coefficient of x (in this case, 18) and b represents the y-intercept (in this case, -4a).