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The best option that would accomplish the goal for using "doggedly" is C. chronically.
The best word to replicate this meaning would be "chronically" because it is a negative word that is used to described a condition that is persistent much like the persistent fatigue of these adolescents.
In conclusion, option C is correct.
Find out more examples of "chronic" in use at https://brainly.com/question/934133.