Which statement best contrasts the character of Brutus with the character of Cassius?

Brutus has a bigger ego and speaks of himself grandly, while Cassius is more modest.
Brutus has a guilty conscience, while Cassius does not seem to feel guilty at all.
Cassius has a cool and self-controlled personality, while Brutus is more excitable.
Cassius has a guilty conscience, while Brutus does not seem to feel guilty at all.