Final answer:
Mark Antony had a loyal and supportive attitude towards Caesar, joining forces with Octavian and Lepidus to avenge Caesar's death and establish his own power in Rome.
Step-by-step explanation:
Mark Antony's attitude toward Caesar can be described as loyal and supportive. After Caesar's assassination, Antony joined forces with Octavian and Lepidus to form the Second Triumvirate and avenge Caesar's death. He fought against Caesar's assassins and established himself as one of the most powerful figures in Rome. Antony also followed in Caesar's footsteps by forming a political alliance with Cleopatra.