Final answer:
The proximal tubule of the nephron in the kidney is made up of simple cuboidal epithelium, which is key in absorption and secretion processes during kidney filtration. The correct option is b.
Step-by-step explanation:
The proximal tubule of the nephron in the kidney is lined with simple cuboidal epithelium. This type of epithelial tissue is noted for its single layer of cube-like cells with centrally located, rounded nuclei. The simple cuboidal epithelium is particularly involved in absorption and secretion processes, which are essential functions in the filtration and reabsorption mechanisms of the kidney. In contrast, options such as stratified squamous, ciliated pseudostratified columnar, and other types of epithelia serve different functions and locations within the body.