(A) Ctrl+B
(B) Ctrl+K
(C) Ctrl+Z
(D) Ctrl+A
🧠 Explanation:
The shortcut key used to select the entire document in MS Word is a simple and widely used command. It allows users to quickly highlight all the text and content in the document without manually dragging the cursor. This shortcut enhances productivity by saving time during editing or formatting tasks. Knowing such shortcuts is essential for efficient use of word processing software.