Which of the following is a Class A felony?

Treason is classified as a Class A felony due to the severe nature of the crime. It involves acts that betray one’s country, such as aiding enemies during wartime or levying war against the United States. Because of the potentially catastrophic consequences of treasonous acts, legal systems impose the harshest penalties, which typically include lengthy prison sentences or even life imprisonment.

In contrast, the other classifications presented, such as Class D and Class C felonies, represent less severe crimes than treason and therefore carry lighter penalties. Capital murder, while extremely serious and often classified at the highest level in many jurisdictions, may not universally align with the "Class A felony" term as used in some criminal codes. Depending on state laws, capital murder may be treated distinctly. This context highlights why the classification of treason as a Class A felony is correct, emphasizing the gravity of the offense in relation to others.