Concept:In a Word document, Ctrl + Home is the shortcut used to move the cursor to the beginning of the very first line of the document.
Explanation:Ctrl + End moves the cursor to the last line of the document, not the first line.
Ctrl + Page Up scrolls the document view upward by one screen but does not take the cursor to the start of the document.
Ctrl + Tab is normally used to switch between open tabs, so it is not relevant for moving within a Word document.
Ctrl + Home immediately moves the cursor from its current position to the beginning of the first line of the first page.
Therefore, the correct key combination is Ctrl + Home.
Answer:C. Ctrl + home.