Final answer:
To paste text from the clipboard above a specific text in a document without opening the Clipboard task pane, you should use the Ctrl + V keyboard shortcut, which is option a).
Step-by-step explanation:
The question is asking about how to paste text from the clipboard into a document without opening the Clipboard task pane, specifically above the text 'electric nerve stimulation.' The correct keyboard shortcut for pasting the text is Ctrl + V. Option a) Ctrl + V is the correct answer because Ctrl + V is the command used for pasting the content of the clipboard in most Windows applications. Ctrl + X is for cutting selected items to the clipboard, Ctrl + C is for copying, and Ctrl + P is for printing the document.