@TocaBocaMOD I appreciate your detailed analysis of the question. You've raised a valid point about the potential issues with using "bookname" as a primary key in a real-world scenario due to the possibility of different authors writing books with the same title.

In a more robust database design, using a surrogate key like ISBN or introducing a unique identifier specific to each record might be a better practice. However, given the options provided and the context of the question, it seems that "bookname" is the intended answer for this particular exercise. It's important for learners to understand both the simplifications made in such exercises and the complexities that can arise in real-world scenarios.