The correct answer is: A. Click on the three dots to the right of the caption entry field.
To enter the input mask wizard, click on the three dots to the right of the caption entry field in the Data Type & Validation group on the Data tab. This will open the Input Mask dialog box, where you can create or edit an input mask for the field.
The three other options are incorrect because they do not open the Input Mask dialog box. Option B, Click on the three dots to the right of the format entry field, opens the Format Cells dialog box. Option C, Click on the input mask toolbar, does not open any dialog box. Option D, Click on the three dots to the right of the input mask entry field, opens the Input Mask Options dialog box, which is a subdialog box of the Input Mask dialog box.
I hope this explanation is helpful. Let me know if you have any other questions.