Why Are One or Two Small Holes Usually Placed in the Occlusal

Why are one or two small holes usually placed in the occlusal portion of the pre-formed celluloid or polymer crown form?

A) To establish occlusion with the opposing dentition
B) To allow excess resin or composite material to flow out when the crown form is seated
C) To create a proximal contact with the adjacent tooth
D) To capture the occlusal contour of the opposing dentition