Help me please I will give brainlest :)) Which of the following statements is TRUE?

A There is no equation in the form y = mx + b that includes all the points in the graph of function 1, so it is not a linear function.

B there is no equation in the form y = mx + b that includes all the points in the graph of function 2, so it is not a linear function.

C The equation y = x + 1 includes all the points in the graph of function 2, so it is a linear function.

D The equation y = 25x includes all the points in the graph of function 3, so it is a linear function.

Help asap