Answer: b. and before their final showdown, Octavian forced the third member, Lepidus, to retire.
Step-by-step explanation:
I am not sure of the question but this is the only correct statement in the text above so has to be the answer.
Pompey was never dictator of Rome and it was Julius Caser who was made dictator was ten years and then for life. Cleopatra never sided with Octavian but rather with Mark Anthony. Octavian refused to fall to her charms after he defeated Mark Anthony and this was why she killed herself.
Julius Caesar was not assassinated by a conspiracy of the Triumvirs because he was the only one left alive of the three when he was killed.
Octavian did however, force Lepidus into retirement when he lured Lepidus's soldiers to his side.