Answer:
A. y=3
Step-by-step explanation:
The line y = 0 is a horizontal line.
Therefore, a line that is parrallel to the above line must also have the form y = c, where c is a constant.
Now looking at the answer choices given we see that y = 3 is the equation we are looking for. Its graph is shown in green in the sketch above.
Therefore, choice A is the correct answer.