Which of the Following Is a Correct Statement Regarding Complete

Which of the following is a correct statement regarding complete performance?

A) Courts today require complete performance in order enforce,in any respect,the rights of the obligor.
B) Courts today do not recognize the doctrine of substantial performance.
C) In many instances,complete performance is difficult,if not impossible,to attain,and courts today generally require only substantial performance.
D) In many instances,complete performance is difficult,if not impossible,to attain,but courts today generally require something more than substantial performance.
E) With due diligence,complete performance is always possible to attain.