Answer:
A. Orthographic mode
Step-by-step explanation:
Orthographic mode presents an orthographic projection that shows us detailed proportions of the object. It is used to present the three-dimensional proportions in two-dimensional settings.
The lines are parallel and the model presents the parallel projection. This means that the lines which are parallel never cross, unlike in the perspective mode. Using both of these and switching between them helps you get a better vision of the object while modeling it.