C.the answer is yes it is a function bc the x values are unique and linear.
TIP: to determine if a graph is a function you can use a vertical line test, if you draw a vertical line (a line up and down) and it intercepts the graph two more times, this is a relation and not a function.
i would find something about how our career paths are kinda determined from childhood. Like how you are as kid has a big reflection on the career you choose.