The answer is C. Adena and Hopewell.
The various cultures collectively termed Mound Builders were inhabitants of North America who, during a 5,000-year period, constructed various styles of earthen mounds for religious and ceremonial, burial, and elite residential purposes. These included the Pre-Columbian cultures of the Archaic period; Woodland period (Adena and Hopewell cultures)
The main reason why the US Senate is often called “the greatest deliberative body in the world" is because it allows each state to have an equal say in legislation regardless of the state's size, which is a powerful function.
The United States often uses sanctions to impose a penalty on a country. This is usually the first step taken when a country upsets another country, before violence is used.