Why did the roman republic use separation of powers in government

the answer is b hope that

the first two years of american revolution was not very encouraging for the patriots since the british were far superior in sea power, arms and troops.

the romans were initially interested in expansion via sicily (which at that time was a cultural melting pot), part of which lay under carthaginian control. at the start of the first punic war (264-241 bc), carthage was the dominant power of the western mediterranean, with an extensive maritime empire

i believe out of the choices it is a.