Based on the evidence provided:
The circular-shaped entry hole from a bullet suggests that the impact was perpendicular to the surface of the glass.
Becke lines appearing around the glass when tested in a liquid indicates that there is a difference in refractive index between the glass and the liquid.
Combining these two pieces of information, the glass was hit straight through (perpendicular impact), and it has a different refractive index than the liquid. Therefore, the correct answer is:
The glass was hit straight through, and it has a different refractive index than the liquid.