A 34-year-old African American woman presents with a three-month history of dry cough, dyspnea on exertion, low-grade fevers, and erythema nodosum on the anterior shins. Examination reveals bilateral parotid enlargement and anterior uveitis. Chest radiograph shows bilateral hilar lymphadenopathy without parenchymal infiltrate. High-resolution CT chest demonstrates perilymphatic micronodules along bronchovascular bundles. Histopathology of a mediastinal lymph node biopsy reveals multiple firm gray-white nodules marked **A** in the diagram, composed of well-formed, non-caseating epithelioid granulomas with Langhans giant cells, and special stains for acid-fast bacilli and fungi are negative. Which of the following best characterizes the microscopic composition of the nodules marked **A**?
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