Which work is identified as Cicero's rhetorical contribution to defending another person?

Pro Sexto Roscio Amerino is indeed Cicero's rhetorical contribution focused on defending an individual, specifically Sextus Roscius, who was accused of murder. In this work, Cicero employs his skills in persuasion and rhetoric to argue for Roscius's innocence, highlighting the importance of legal advocacy in Roman society.

This work is an excellent example of Cicero's ability to use rhetorical techniques to sway public opinion and legal outcomes. Cicero's defense hinges on presenting evidence, dismantling the allegations made against Roscius, and appealing to the emotions and reason of the audience. The language and structure of the oration demonstrate Cicero's mastery of rhetoric, making it a significant piece in both legal and literary history.

In contrast, In Catilinam focuses on Cicero's address against the conspirator Catiline rather than defending an individual, Pro Archia is a defense of a poet's right to citizenship, and De Officiis is a philosophical treatise on duty rather than a legal defense. Each of these works serves different purposes within Cicero's broader contributions to literature and public life, but only Pro Sexto Roscio Amerino is specifically centered around defending another person in a legal context.