What was the impact Julius Caesar had on Rome?

A) Julius Caesar worked to build the strength of the Roman senate. He worked with others to greatly expand the territory of Rome through diplomacy.
B)Julius Caesar overthrew the Senate and became the first emperor of Rome with the people's support.
C) Julius Caesar was popular amongst the plebeians of Rome, so when the senate assassinated him, it led to the downfall of the Republic and the creation of the Roman Empire.