Step 1: Understanding the meaning.
Friendship networks outside college hide signs of maladjustment, meaning recognizing the issue early becomes more difficult.
Step 2: Analyzing options.
(A) treatment – compounded: Treatment isn't the earliest stage, and compounded is incorrect.
(B) detection – facilitated: Facilitated means made easier, which contradicts the sentence.
(C) identification – complicated: Identification fits “early stage,” and complicated matches the idea of masking signals.
(D) prevention – helped: Prevention is unrelated to the concept being discussed.
Step 3: Conclusion.
The only pair that matches both logical and grammatical meaning is “identification – complicated.”