PLEASE HURRY IM RUNNING OUT OF TIME ON MY TEST GIVING 50 POINTS

Which statement BEST explains why the percentage of union membership in nonagricultural jobs today is lower than it was in the mid-1940s?
A.
Waves of recent strikes and economic hardships have caused growing anti-union feelings.
B.
Mediation and arbitration have reduced the need for picket lines and active striking by union members, resulting in decreased interest and awareness of unions.
C.
The risk of losing one’s job due to union membership is too great of a risk in unstable economic times.
D.
The vast improvements already made have reduced the incentive to push for change.