How can one recover a locked Facebook without asking one’s friends for help?

I logged into Facebook from a different country where I am typically located: the account got locked. It seems that one can unlock the account with different ways but as shown in the example below, it seems that in practice only asking one’s friends for help works when I tried, as I keep getting a “please select a challenge” error message:

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How can one recover a locked Facebook without asking one’s friends for help?