When We Plot X Versus Y, the Graph of the Model

When we plot x versus y, the graph of the model $y = \beta _ { 0 } + \beta _ { 1 } x + \beta _ { 2 } x ^ { 2 }$ + $\varepsilon$ is shaped like a:

A) straight line going upwards.
B) straight line going downwards.
C) circle.
D) parabola.