During Authorization Card Drives,management Is Prohibited from Doing All of the Following

During authorization card drives,management is prohibited from doing all of the following except:

A) threatening negative consequences for unionization votes.
B) changing working conditions to show that they are responsive to employee needs.
C) encouraging individual employees friendly to management to report on organizing meetings.
D) promising raises or benefits changes if employees vote against unionization.
E) questioning employees about who is leading organizing efforts and what is going on in organizing meetings.