Final answer:
When f(x) is constantly -3 for any value of x, f(19) also equals -3. Therefore, the complete statement is f(19) = -3, which corresponds to answer choice (a).
Step-by-step explanation:
If the function f(x) is defined such that f(x) equals -3 for any value of x, then substituting any number in place of x will yield the same result. When we are given that f(x) = -3, this implies that no matter what value we substitute for x, the result for f(x) is always -3. Therefore, when we evaluate f(19), the statement we complete is:
f(19) = -3.
Based on the given options, the correct answer would be:
a) -3