Answer:
A. Brilliant
Step-by-step explanation:
If scintilla means spark, then the other options do not make much sense. Dispirited, tedious, and listless do not have anything to do with spark, leaving us with "brilliant"
Definition of scintillating from Oxford Languages: "brilliantly and excitingly clever or skillful."
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I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly.
- Heather