Terminal differentiation typically refers to the process where stem cells or progenitor cells mature into their final, specialized forms that will no longer divide or change. Among the options provided, hair cells, heart cells, and epithelial cells can undergo terminal differentiation. However, if we are selecting a single cell type that is commonly associated with this process, we would refer to hair cells or heart cells, as they are specialized cells that have undergone terminal differentiation from progenitor or precursor cells.
If you need to specify only one type, you might choose hair cells as they are often cited in discussions of sensory cell differentiation.