Final answer:
The shape of the nail matrix affects the growth of the nail plate, with a longer matrix producing a wider nail, and a highly curved matrix leading to a more curved nail edge. The correct answer is C) Wider, flat.
Step-by-step explanation:
The student's question relates to the anatomy of the nail plate and how the shape of the matrix affects the way a nail grows. A longer matrix tends to produce a wider nail plate, while a highly curved matrix is associated with a highly curved free edge of the nail. Therefore, the correct answer to the question is:
A longer matrix produces a wider nail plate and a highly curved matrix creates a highly curved free edge.
The most appropriate answer from the options provided is C) Wider, flat, as it corresponds accurately with the relationship between the matrix shape and the resulting nail plate. It's essential to understand the physiology of the nail for proper nail care and health.