Conclusion : Due to campaign, the complaints tripled.

To weaken this, we will need to show that some other factors were in play for the increase in the complaints.

A. The increase in harassment complaints has consisted almost exclusively of additional complaints of racial harassment; complaints of other varieties of harassment have not increased significantly. - irrelevant as we need to show other reason for the increase.

B. Although the number of complaints has tripled, the number of complaints that have resulted in successful prosecutions or civil penalties for the harassers has not increased significantly. - out of scope. successful prosecution or penalties are not into question

C. Many individuals who have brought complaints within the past year were previously unaware that the behavior to which they had been subjected was regarded legally as harassment. - Tempting but does not seriously weaken the conclusion.

D. The publicity campaign has emphasized the fact that there will be no legal reprisals or other negative consequences for complainants whose complaints are deemed false or invalid. - This is right. People filed complaints as it was clearly emphasized in the campaign that there won't be any -ve consequences.

E. The city attorney’s office originally instituted the campaign in response to falling numbers of workplace harassment complaints. - Does not explain why the number rose?