Since the Bill of Rights' Ratification, Thousands of Amendments to the Constitution

Since the Bill of Rights' ratification, thousands of amendments to the Constitution have been proposed, but only 15 have been added.Why have so few made it past the finish line?

A) The overwhelming majority of proposals dealt with social policy issues, while those ultimately accepted dealt with the structure or composition of government.
B) Not only is the amendment process challenging, but established procedures and institutions are hard to change once people have a vested interest in defending the status quo.
C) The Constitution's framers included just enough vague wording in the document to leave it open to almost any interpretation over time.
D) Consensus against changing the Constitution has been built among the nation's elites and leadership over time.