Which Treaty or Act Goes Back Through Several Iterations to the Original

Which Treaty or Act goes back through several iterations to the original Treaty of Rome and contains the detail of the structure and operation of the European Union?

A) The Human Rights Act 1998
B) European Union Act 2011
C) The Charter of Fundamental Rights of the European Union (CFREU)
D) The Treaty on European Union (TEU)
E) The Treaty on the Functioning of the European Union (TFEU)