When is character evidence admissible according to legal standards?

Character evidence is admissible under specific legal standards, and in this instance, the answer encompasses several valid scenarios where such evidence can be introduced.

Character is admissible when it is a key element of a crime or claim. For instance, in defamation cases, the character of an individual may become integral to the claims being made. Similarly, if a person’s character is an essential part of the legal dispute, it allows for the introduction of relevant character evidence.

Additionally, when a victim's character is at issue, such as in self-defense cases, a defendant may introduce evidence to demonstrate the victim's aggressive nature if it supports the claim of justification for the defendant’s actions.

Lastly, the concept of "opening the door" pertains to situations where a party introduces character evidence into the proceedings, which allows the opposing party to respond with their character evidence to provide balance and context to the testimony.

Thus, the correct answer highlights that character evidence is admissible in all of these instances: as a key element, when a victim's character is at stake, and when a party has opened the door for its introduction.