To add standard French holidays to your calendar, the user can follow the steps below:

Option B is correct.

Explanation: B. Click Add Holidays in the Calendar Options dialog box and select the check box for France.

Option A is incorrect because enabling French language options in Control Panel and downloading the holidays from the Microsoft Office Tools on the Web site is not necessary to add French holidays to your calendar.

Option C is also incorrect because researching the dates of French holidays and entering them as all-day events is time-consuming and unnecessary when there is an easier way to add them.

Option D is incorrect because there is a correct option.

Therefore, the answer is: B. Click Add Holidays in the Calendar Options dialog box and select the check box for France.