A 46-year-old woman presents with fatigue, weight gain, and cold intolerance. Laboratory testing reveals elevated thyroid-stimulating hormone (TSH) and decreased free thyroxine (T4). A thyroid biopsy is performed. Histologic examination demonstrates large follicles filled with abundant colloid, flattened follicular epithelial cells, and relatively decreased capillary density in the surrounding stroma. Which interpretation best explains the relationship between these histologic findings and thyroid gland function?

The thyroid gland is highly active, rapidly synthesizing and releasing thyroid hormone, resulting in depletion of colloid and tall columnar follicular cells.

The thyroid gland is inactive, characterized by storage of thyroid hormone within colloid and reduced endocytosis, leading to large follicles with flattened epithelial cells.

The thyroid gland is undergoing hyperplastic change secondary to persistent TSH stimulation, resulting in small follicles and increased vascularity.

The thyroid gland is recovering from acute inflammation, demonstrating transient colloid accumulation with increased hormone secretion.