$($Scenario $11-5)$ One last thing that she recommends to the client involves her choice of a particular element from among hundreds of options. She admits she has agonized over her selection on this because it affects not only readability, but also sets the mood and tone of the overall visual impression. She is most likely talking about the:

a$.$ typeface.

b$.$ illustration format.

c$.$ color.

d$.$ layout.