Final answer:
The most famous victim of the 2nd Triumvirate's proscription was Cicero. The First Triumvirate consisted of Caesar, Pompey, and Crassus, while Octavian's civil war success was mainly due to support from Julius Caesar's veteran soldiers. The Second Triumvirate was established following the assassination of Caesar.
Step-by-step explanation:
The most famous victim of the 2nd Triumvirate's proscription was b) Cicero. Marcus Tullius Cicero, an eminent Roman statesman, orator, and writer, was targeted for his political position and criticisms. The 2nd Triumvirate, composed of Mark Antony, Octavian (the future Augustus), and Lepidus, was established to consolidate power after the assassination of Caesar. They carried out proscriptions that led to the confiscation of property and execution of their enemies, including Cicero, who had supported the Republic and opposed Mark Antony.
First Triumvirate Members
Answering the related question, the members of the First Triumvirate were b) Caesar, Pompey, Crassus. This informal alliance was formed in 60 BCE between three prominent Roman politicians and had significant implications for the Roman political landscape.
Octavian's Civil War Support
Regarding Octavian's success in the civil war, it was due largely to support from c) Julius Caesar's veteran soldiers. These soldiers were loyal to Caesar's legacy and provided the military strength Octavian needed to prevail over his adversaries.
Assassination Leading to the Second Triumvirate
The event that led to the establishment of the Second Triumvirate was a) the assassination of Caesar. This triumvirate was a political alliance created to secure power and carry out vengeance against Caesar's killers and their supporters.