Figures A & B both have very high rates of deflection, although Figure A could penetrate if the velocity of the round was high enough, Figure B has a near impossible rate of penetration. Such rounds could be the result of a bounce, or passing through another object before striking the armor.
Figure C, Is a partially deflected round. While that could ALSO be the result of a bounce, it is more likely that the armor deflected it up and into the armor. Even if the round penetrated, because of the angle of it's travel through the armor, damage to critical systems/crew is far more unlikely.
Figure D is very similar to Figure C In that the round was partially deflected on impact, However, Due to the velocity, (which was apparently slightly higher than that of Figure C,) the round was force onto a different angle of penetration after the initial deflection.
Figure E has the highest chance of penetration. Notice how much closer it is to penetrating completely through the armor than the other Figures. With a slightly higher round velocity, that projectile would have penetrated through the armor and potentially caused damage to the systems and crew inside.
Figure E's angle of attack is the best possible when a 90 degree angle cannot be made.
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