Answer :
The best option that would accomplish the goal for using "doggedly" is C. chronically.
What is point of the underlined word?
- Doggedly refers to something that is showing persistence.
- It means therefore, that adolescents are persistently tired.
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.