Answer: The correct option is (C) 
Step-by-step explanation: We are given to write a rule for the linear function given in the graph.
Since the graph is a straight line, so we are to find the equation of the line to find the rule.
From the graph, we note that
the points (3, -1) and (4, 3) lie on the straight line.
So, the slope of the line will be

Since the line passes through the point (4, 3), so the equation of the line is given by

Thus, the required rule for the linear function is

Option (C) is correct.