What Is the Difference Between Cofactors and Coenzymes

Multiple Choice

What is the difference between cofactors and coenzymes?

A) Cofactors tend to be complex molecules, but coenzymes are generally ions.
B) Cofactors are not necessary, but coenzymes are necessary.
C) Cofactors can be inorganic or organic, but coenzymes are always inorganic.
D) Cofactors can be inorganic or organic, but coenzymes are just another name for organic cofactors.