Which of These Statements Summarizes the Second Law of Thermodynamics

Which of these statements summarizes the Second Law of Thermodynamics?

A) One usable form of energy cannot be completely converted into a more useable form.
B) One usable form of energy can be completely converted into another useable form.
C) Energy can be created and destroyed.
D) Energy cannot be created or destroyeD.
E) Energy cannot be transformed.