Explanation:
a . New workers will be hired by the company after the pandemic.
( b. ...... I think its already in passive voice )
c. The potholes were repaired by the workers last week.
This one is kinda hard. I would say B or C. Use the one you would use in a paragraph about it.
I think it would be the first answer
Stay focused, don’t let your other commitments distract you, do further learning to help yourself