Answer:
B
Step-by-step explanation:
A function passes the vertical line test. In other words, an x value cannot have multiple y values but can have multiple x values per one y value. This is why:
Since a function has to pass the vertical line test, any function you draw can be validated a function or not a function simply by passing something straight like a pencil down the graph vertically and seeing if the pencil is intersected by the line once. If once, it is a function. If it goes more than once, it is not.
This means that an x value cannot have multiple y values as this is the root of the issue that makes a graph not a function.
Domain basically means an x value and range means y value. In this case, 3 has two y values, 6 and 16, which makes this NOT a function.
