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a.) java.awt.Toolkit.getDefaultToolkit().getSystemClipboard()

its C according to java awt docs.

There are two different types of clipboard - system and local.
To access the system clipboard, assign a reference from the system clipboard to the Clipboard class
you need to use:
A. java.awt.Toolkit.getDefaultToolkit().getSystemClipboard()

For local Clipboard you could use answer C but I believe the constructor needs a String
so it would need to be:
new java.awt.datatransfer.Clipboard(“My Clipboard”)


Ref: docs.oracle.com






Accessing the system clipboard or creating a local clipboard is different but straightforward.

I'm sorry the last sentence: "Accessing.... " got copied from somewhere by accident.