The answer for the question above is the option D, which is:D y=2, 5, 8, 11,... The explanation for this answer is shown below: As you can see, the option D, y=2, 5, 8, 11,...increase with a constant factor of 3, and the other options do not increase with a constant factor, therefore, they are not linear functions. Finally, keeping the information above on mind, you have that the linear function is the following: f(x)=3x-1.