In the following question, a sentence has been given in Active/Passive voice. Out of four alternatives suggested, select the one which best expresses the same sentence in Passive/Active voice. I had to stop all my work to complete this project.

For completing this project all other work must be stopped.

To complete this project all other work had been stopped by me.

For completing this project I had to stop all my work.

All other work had to be stopped to complete this project by me.