Final answer:
The term that accurately describes music not being recognized as valuable in early 1900s hospitals is 'disregarded'. This implies that the potential benefits of music in medical settings were not acknowledged.
Step-by-step explanation:
In the early 1900s, music was not being used in hospitals as music was no longer recognized as valuable in a medical setting. The term that best fits the meaning of 'not recognized as valuable' from the given options is 'D) Disregarded'. When something is disregarded, it means that it has not been given sufficient attention or deemed as valuable. This echoes the sentiment that, at that time, the potential valuable impact of music on patient care and recovery was not appreciated or capitalized upon in the realm of medicine.