The keyboard shortcut Ctrl + N is used to create a new, blank workbook in Microsoft Excel. A new workbook, by default, contains at least one new worksheet. While the specific shortcut to insert a new worksheet into an existing workbook is Shift + F11, this option is not provided. Among the given choices, Ctrl + N is the only command that results in the creation of a new worksheet, making it the correct answer in this context.

A. Ctrl + A: This shortcut selects all cells and objects in the active worksheet; it does not create a new one.
B. Ctrl + W: This shortcut closes the active workbook window.
C. Ctrl + S: This shortcut saves the active workbook.

1. Microsoft Corporation. (n.d.). Keyboard shortcuts in Excel. Microsoft Support. Retrieved from https://support.microsoft.com/en-us/office/keyboard-shortcuts-in-excel-1798d9d5-842a-42b8-9c99-9b7213f0040f. (See the section "Ctrl key combination shortcuts," which lists Ctrl+N for "Create a new, blank workbook.")

2. MIT Sloan School of Management. (2016). Excel 2016 Core: Part 1. Massachusetts Institute of Technology. Page 6, "File Tab & Backstage View," lists Ctrl+N as the shortcut for "New Workbook."

3. University of Wisconsin-Madison. (n.d.). Excel: Keyboard Shortcuts. Software Training for Students. Retrieved from https://it.wisc.edu/services/software-training-for-students-sts/. (This resource, under its Excel materials, confirms Ctrl+N for creating a new workbook.)