The answer choice which is a function among the given answer choices is; Choice B as they are all correct.
What is a function and what defining property certifies a relation as a function?
From conventional mathematics, a function from a set x to a set y assigns to each element of X exactly one element of Y.
The set of values x is called the domain of the function and the set of values y is called the codomain/range of the function.
Functions basically represents the idealization of how a varying quantity depends on another quantity.
It therefore follows from the paragraph above that all of the answer choices are functions.
Therefore, the answer choice which is a function among the given answer choices is; Choice B as they are all correct.
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