Final answer:
Miss Scarlet admits uncertainty in Scene 3 by acknowledging that something is now unknown or unresolved with her statement 'Looks like now we'll never know.'
Step-by-step explanation:
Based on the provided excerpt, Miss Scarlet in Scene 3 appears to be admitting uncertainty. Her statement, "Looks like now we'll never know," suggests that she acknowledges the existence of unknown information or unresolved issues. This resembles the sentiments expressed by other characters in the additional quotes, where they use phrases like "I don't know" or express doubt about a situation or the knowledge of others. Acknowledging uncertainty is a common theme in literature and can be a way for characters to portray realism and depth, as it reflects the complex nature of life where not everything is known or certain.