The correct answer is: A. Ctrl + A
Payroll Auto Fill is a feature in Microsoft Excel that allows you to automatically fill in data from a previous pay period. To use Payroll Auto Fill, select the cells that contain the data you want to fill in, and then press Ctrl + A. Excel will automatically fill in the data from the previous pay period.
Option B, Alt + A, is not a valid keyboard shortcut for Payroll Auto Fill. Option C, Ctrl + B, is a keyboard shortcut for bolding text. Option D, Alt + B, is a keyboard shortcut for italicizing text.