Why is it recommended for someone who is fighting off a potential rapist to act as if they were ...

Why is it recommended for someone who is fighting off a potential rapist to act as if they were protecting their sister, mother, or child?
 
  a. Images of these people can cause a surge of adrenaline, which will increase the actual strength of the victim.
  b. Images of these people can cause a surge of adrenaline, which will increase the perceived strength of the victim.
  c. Women tend to fight harder to protect a loved one than they will to protect themselves.
  d. The woman will feel empowered and surrounded by her loved ones.