False, legislative branch is the most powerful
An important scientist at the time, besides, those who were mentioned was Copernicus - A.
Spartacus was just a slave general in the Roman republic.
Rousseau was a philosopher.
Plato was a philosopher as well.
The correct answer for that reason is Copernicus, he was an astronomer and a major figure at the time.
Government should serve the people
The Louisiana Purchase by far, it doubled the nation's land and acquired New Orleans