Answer:
A. It is linear because it has a constant rate of change.
Step-by-step explanation:
A straight line graph is possible between two variables x and y only if there is a constant rate of change
y = mx+b is the equation of a straight line in general and here we find rate of change of y with respect to x is constant m which does not depend on x or y.
In other words, throughout the domain a straight line has constant slope.
Here we find that the graph given is a straight line.
Hence option A is suitable answer
A. It is linear because it has a constant rate of change.
