The correct answer is A. Started.
To commission something means to start it or to put it into operation. For example, a new ship might be commissioned when it is launched for the first time, or a new hospital might be commissioned when it opens its doors to patients.
The other options are incorrect because they do not mean to start something. To close something means to stop it or to bring it to an end. For example, a business might be closed when it goes bankrupt, or a school might be closed when it is no longer needed. To finish something means to complete it or to bring it to an end. For example, a project might be finished when it is completed to the satisfaction of the client, or a race might be finished when the winner crosses the finish line. To terminate something means to end it or to bring it to a close. For example, a contract might be terminated when one of the parties breaches the contract, or an employee might be terminated when they are fired.