She gets up early … the weekdays.
This test is concerned with the preposition problem and the correct answer is ©, but I would like to call your attention in other respects: Is “the” correctly used in the sentence?
As far as I know "[i]at the weekend[/i]" is considered to be fixed expression, in which "the" cannot be omitted. Am I right? What about [i]on (the) weekdays[/i]? Thanks.