Final answer:
A. Cognitive-behavioral therapy is the most effective theoretical approach for working with Latina/o/x adolescents to address behavior issues.
Step-by-step explanation:
The theoretical approach that has been demonstrated to be effective for working with Latina/o/x adolescents to address behavior issues is cognitive-behavioral therapy.
This approach combines techniques from both cognitive therapy and behavior therapy to focus on changing negative thoughts and behaviors. It helps individuals identify and challenge their irrational beliefs, develop healthier thinking patterns, and learn new coping strategies.
One study by Alavi et al. (2013) found that cognitive-behavioral therapy was effective in decreasing su icidal ideation and hopelessness in adolescents with previous su icidal attempts.