Final answer:
Congress held hearings to investigate the police superintendent for not providing adequate protection during a women's suffrage parade, which was part of a broader movement leading to the passing of the 19th Amendment. The correct option is C.
Step-by-step explanation:
There were congressional hearings following the completion of the parade to investigate the police superintendent for failing to protect the women participating in the event. The hearings were a response to the insufficient measures taken to ensure the safety of the women who were advocating for their right to vote.
This scrutiny came at a time when the women's suffrage movement was leveraging growing support, employing a variety of tactics from peaceful picketing to legal actions, and challenging notions of gender equality through activism, all contributing to the eventual success of passing the 19th Amendment granting universal suffrage.