Stress Marks on the Edge of a Radial Crack near the Point

Multiple Choice

Stress marks on the edge of a radial crack near the point of impact are:

A) perpendicular to the side on which the force was applied.
B) parallel to the side opposite the side on which the force was applied.
C) perpendicular to the side of the glass facing outdoors.
D) parallel to the side on which the force was applied.
E) none of the above