<u>Answer:</u>
The correct answer option is: Each x value has one and only one y value.
<u>Step-by-step explanation:</u>
A relationship from a set of inputs to a set of outputs where each input has exactly one corresponding output value is said to be a function.
Here, we are given which happens to be a function as no x value is repeated and there is only one corresponding y value to it.
Therefore, option c is the correct answer.