The Constitution's Framers Decided to Have Senators Appointed for Six-Year

The Constitution's framers decided to have senators appointed for six-year terms because:

A) they would not have to worry about reelection campaigns for several years, freeing them to take a long-term view of policymaking.
B) the Senate was asked to handle important deliberative duties, such as conformation of presidential appointments and treaty approval, that required more time and knowledge to handle.
C) the framers saw senators as more important than presidents or representatives, who were to serve shorter terms.
D) this would insulate the lawmakers from what they called "excessive democracy."