Final answer:
The correct statement about music notation in ancient Egypt is that they had a system of written musical notation but we do not know how to read it today.
Step-by-step explanation:
The correct statement about music notation in ancient Egypt is A. They had a system of written musical notation but we do not know how to read it today. Ancient Egypt did have a system of music notation called hieroglyphics, which were symbols that represented musical sounds and rhythms. However, the exact interpretation of these notations is still not fully understood today.