Sarcoidosis with Bilateral Hilar Lymphadenopathy (Stage I-II)

A 32-year-old African-American woman presents with a 6-week history of dry cough, exertional dyspnea, and fatigue. She has tender erythematous nodules on both shins, arthralgias affecting the ankles, and anterior uveitis on slit-lamp examination. Chest radiograph shows the classic "1-2-3 sign" with right paratracheal lymphadenopathy and symmetric bilateral hilar lymphadenopathy. The structure marked **C** (left hilar lymphadenopathy) is part of the radiographic hallmark that defines which Scadding stage of pulmonary sarcoidosis?