<em>A relation between a set of inputs having one output each. </em>
<em>Every function has a domain and codomain or range. </em>
<em>A function is generally denoted by f(x) where x is the input.</em>
<span>According to MLA style, you must include Works Cited at the end of any writing project that contains research</span>
You can eliminate C because that is a Flat Character.
The answer is A from what I see.
