Does this table represent a function, why or why not

For this case we have that a function is defined as the relationship that exists between two sets. In said relation, each element of the starting set (represented by the variable "x"), corresponds to a single element of the arrival set (represented by the variable "y").

Thus, we observe in the table that each value of the starting set corresponds to a single element of the arrival set. Then we have a function.

Option B