Answer:
C. Senators vote on who should fill the vacant seat is the correct answer.
Explanation:
The Seventeenth Amendment deals with the election of Senators and the ways to fill the vacant seats. If there is a vacancy due to senators resignation, death or expulsion then the state legislature can appoint replacement to hold office until a special election takes place. But there are few exceptions such as some states are required to appoint the replacement from the same political party. The other three options are correct because-
The Senators must be thirty years of age and should have been a US citizen for last nine years and should be a resident of the state from where he/she would be chosen.
A Senators term in office is six years and one third of total members of the senate are elected after every two years.
The vice president is the president of senate. In his absence the others designated by him presides over the proceedings.
The senate is consists of Senators and each one of them represents a particular state and regardless of its population each state is represented by two senators. There are 50 states in the union and 100 senators.