Which statement is correct?

the roman senate was the part of the republic’s government that oversaw domestic and international legislation.
the roman senate was not connected to the roman republic.
the roman republic was the part of the senate’s government that oversaw domestic affairs only.
the roman senate was the part of the republic’s government that oversaw international affairs only.

The Roman Senate was the part of the Republic’s government that oversaw domestic and international legislation.

Explanation:

The Roman Senate functioned as an advisory body to Rome's magistrates and, composed as it was of the city's most experienced public servants and society's elite. It was the predominant branch of the Republic's government, according to Greek historian Polybius.

The Roman Assemblies' members of this Senate had ultimate authority over elections, legislations, and criminal laws; this organization had the most control over day-to-day life.