Final answer:
The domain of the function f(x) is all real numbers from 0 to 20, inclusive. None of the provided answer choices correctly represent this domain.
Step-by-step explanation:
The domain of a function includes all the possible values of x that the function can accept. In this case, the function f(x) is defined for 0 ≤ x ≤ 20, so the domain of f(x) is any real number from 0 to 20, inclusive. Looking at the options provided, none of them perfectly match this range. However, if there's a typo and the options were meant to represent intervals, then the closest option would be B. x, assuming the '54' is a typo and it should be '4', but technically this answer is still incorrect as it does not cover the entire range of 0 to 20. The correct domain of the function is not represented in any of the given choices.