Answer: the powerful skills of deception the Devil has
Step-by-step explanation:
Allusion simply means the act of making indirect reference to a particular thing.
When Rebecca Nurse is charged, Hale is troubled. The intent of the allusion to the story that the Devil was once an angel is that the powerful skills of deception that the Devil has.
Other options such as the impossibility of determining God's will, that even beauty is no indicator of goodness and that people sometimes change as they get older isn't the correct options.