Final answer:
When too many items are placed on the Clipboard, it generally replaces the oldest item with the newest one, unless advanced clipboard management features are being used.
Step-by-step explanation:
When too many items are placed on the Clipboard, it depends on the operating system and the clipboard manager in use. For many basic clipboard managers, such as the one in Windows, the Clipboard will replace the oldest item with the newest one once the capacity is exceeded. To be specific, the answer to your question would be C) The Clipboard replaces the oldest item with the newest one. Modern operating systems or third-party clipboard managers may handle clipboard history differently, allowing several items to be stored and accessed. But in the general sense, without additional clipboard management features, the clipboard holds only the most recent item copied.