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Exposure and Response Prevention (ERP) is the gold-standard psychosocial treatment for OCD. ERP systematically and collaboratively exposes clients to obsessional cues (e.g., touching “contaminated” surfaces) while preventing the compulsive response (e.g., handwashing). Through repeated, prolonged exposure without ritualizing, the client experiences corrective learning: anxiety naturally habituates, and new inhibitory learning forms, weakening the obsession-compulsion loop. The treatment is typically embedded within CBT, including psychoeducation, hierarchy development, cognitive work targeting threat overestimation/intolerance of uncertainty, and skills for managing urges. Systematic desensitization (Option A) can reduce general anxiety but lacks the response-prevention element critical to OCD. Psychodynamic therapy (Option C) may enhance insight but, as a stand-alone, has less evidence for OCD symptom reduction compared to ERP. EMDR (Option D) is well supported for PTSD, not as a primary treatment for OCD. ERP can be combined with SSRIs for moderate-to-severe cases, and careful assessment of safety, readiness, and family accommodation improves outcomes. Treatment fidelity, homework adherence, and measurement-based care (e.g., Y-BOCS tracking) are essential for effectiveness.