What is the constant of proportionality for the graph?
A Cartesian coordinate graph with an x horizontal axis and y vertical axis intersecting at origin point left parenthesis 0 comma 0 right parenthesis. X values range from negative 10 to 10 and y values range from negative 10 to 10. A diagonal bidirectional line extends from quadrant III through the origin into quadrant I.
A. 0.5
B. 1
C. 2
D. 6