What distinguishes a Constructive Change from an Unauthorized Commitment?

A Constructive Change can be caused by the Contracting Officer who inadvertently didn't follow the procedures of the Changes Clause.

An Unauthorized Commitment can be caused by the Contracting Officer who inadvertently didn't follow the procedures of the Changes Clause.

Answer: Statement A

Explanation: A constructive change occurs when the government without adhering to the change clause, changes certain terms of the contract.

Unauthorized commitment are those agreement which, due to lack of authority by the government representative resulted into a non binding agreement.

So, we can say that in a constructive change the contracting officer has the authority but in unauthorized agreement he did not.

Thus, statement A is correct.