The US Senate Was Created as a Slower, More Deliberative Body

The U.S. Senate was created as a slower, more deliberative body in which legislation is forced to proceed at a more thoughtful pace. What is a primary reason for this design?

A) To serve as an antagonist to the U.S. House of Representatives
B) To protect the integrity of the Congress and to protect the people from radical shifts that result from swift changes in popular opinion
C) To protect legislation from a presidential veto
D) To make sure that the legislation is enforceable
E) The arrangement was not by design, but evolved over time