The Phenomenon Known as Weapon Focus Is an Example of What

The phenomenon known as weapon focus is an example of what?

A) Mood-congruent memory, where people remember what weapon they saw at the scene of the crime when they are put back into a negative emotion state
B) Affect-as-information, where people use their negative emotion in response to seeing a weapon as a guide for evaluating the weapon
C) Affect-generated false memories, where people in a high-arousal negative state will tend to misremember negative details
D) How threatening stimuli like a gun narrow the scope of attention at the expense of processing and remembering other information