Answer:
C. Labor unions deteriorated as employers fired striking workers and replaced them.
Step-by-step explanation:
The Professional Air Traffic Controllers Organization(PATCO )was a United States trade union that was responsible for the welfare of aviation workers.
An illegal strike in August 3, 1981 occurred, seeking better working conditions such as reduced 32-hour work week and a $10,000 pay increase.
President Reagan fired all the aviation staffs and new set of people were trained and hired.