One Problem with Research on the Effects of Self-Protection Tactics

One problem with research on the effects of self-protection tactics is determining whether _____________.

A) The victim's injuries were sustained before or after resisting the attack.
B) The victim's injuries were severe enough to require medical attention.
C) A jury will take the victim's injuries into account during deliberation.
D) The offender sustained similar or worse injuries than the victim.
E) All of the above are problems with this research.