Explanation
### Why this is right
Ctrl+A selects all text, Ctrl+X cuts that selection, and Ctrl+V pastes it into the other document. Cut is needed for a move because it removes the source content when pasted elsewhere.
### The concept
Copy and cut both place selected data on the clipboard. Copy leaves the source in place, while cut is the appropriate command when the aim is to move the selection.
### The other options
- **B. Ctrl+A, Ctrl+C, Ctrl+V**: copies all text and leaves the original in place, so it duplicates rather than moves.
- **C. Ctrl+C, Ctrl+X, Ctrl+Z**: does not select all or paste into the destination.
- **D. Ctrl+S, Ctrl+O, Ctrl+N**: saves, opens, and creates items; it is not a text-transfer sequence.
### Terms
- **Clipboard**: temporary storage for cut or copied content.
### Remember
For a move, select, cut, and paste; for a duplicate, select, copy, and paste.
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