What marked the official transition from roman republic to roman empire

When Augustus, formally known as Octavian became Emperor of Rome

Explanation:

With the conclusion of the Battle of Philippi in 42 BC, Augustus and his cohorts dissolved the Roman Republic. This marked the beginning of the Roman Empire which was ruled by Augustus until his death in AD 14.

i think the answer is b.

hello! : )

i think a judge or jury, as they preside over the court and is the central figure in a trial.

hope this and i hope i answered in time!

good luck!

~ destiny ^_^