Find the error. The situation has worsen with the growing population and traffic over the years.

A situation has worsen with the growing population and traffic over the years.

The situation has worsen with the growing population and traffic with the years.

The situation has worsened with the growing population and traffic over the years.

The situation has worsened with the growing population and traffic over the year.

Option C is correct because worsened is the third form for worse.