Which crime is an example of treason?

Treason is defined as an act of betrayal or disloyalty to one's country, particularly during times of war. Assisting foreign enemies during wartime directly undermines the nation's security and interests, which is the essence of treason. This could involve providing intelligence, material support, or any action that aids an enemy force against one’s own government.

The other options describe crimes that, while serious, do not involve the unique context of betrayal against the state or allegiance. Robbing a bank is a theft crime, breaking and entering is a property crime, and assaulting an officer is an act of violence against law enforcement. None of these crimes entail the specific disloyalty to one’s nation that defines treason. Thus, assisting foreign enemies is the only act that meets the legal and ethical criteria for treason.