Based on the form of the equation, what is the best way to graph the line 3x+3y=15?
Select the correct answer below:

A. Recognize the equation as that of a vertical line passing through the x-axis at 15.

B. Recognize the equation as that of a vertical line passing through the x-axis at 15.

C. Identify the slope and y-intercept, and then graph.

D. Find the x- and y-intercepts, and then graph.