Question

Which step is first in changing the proofing language of an entire document?

Click the Language button on the Status bar.
Select the whole document by pressing Ctrl+A.
Under the Review tab on the ribbon in the Language group, click the Language button and select Set Proofing Language.
Run a Spelling and Grammar check on your document before changing the language.

Answer 1

Select the whole document by pressing Ctrl+A.

You must select all the text first so the proofing-language change applies to the entire document.