Step 1: Understanding the Question:
We are asked to identify the keyboard shortcut that allows a user to insert a new slide into an active presentation file (such as MS PowerPoint or OpenOffice Impress).
Step 2: Key Formula or Approach:
Review the standard shortcut keys in presentation software:
• $Ctrl + N$ is used to open an entirely new presentation file.
• $Ctrl + A$ is used to select all elements on the current workspace.
• $Ctrl + M$ is used to insert a new slide into the active presentation.
Step 3: Detailed Explanation:
While many beginners mistakenly try to use $Ctrl + N$ to add a slide because "New" starts with 'N', doing so will actually open an entirely new document window. To add a new slide to the current open file, the correct software shortcut key combination is $Ctrl + M$.
Step 4: Final Answer:
The correct option for adding a slide to a presentation is $Ctrl + M$, which corresponds to option (D).