Final answer:
The phrase 'unsealed our fates' suggests a critical action or event that solidifies the future for those involved, best indicated by choice A which suggests life-defining roles for Initiates conveyed through scraps of paper.
Step-by-step explanation:
The phrase unsealed our fates implies that a decisive action or event has determined the future outcomes for the individuals involved. This typically means that the actions taken or the information revealed has a significant effect on what will happen to the characters in the narrative. In the context of the question, choice A (The scraps of paper contain roles that define the course for each Initiate's life) most closely aligns with the meaning of the phrase, as the papers would have significant, life-altering information for the Initiates.