Choose the correct indefinite article for the following word. lección una Ounas O unos O O

Look at the image, read, and select the correct option. two month calendar with the vacaciones de navidad week highlighted in green on the first month of the year, the week goes from day 1 to day 7, with the first day of the week being monday. the dia de andalucia is highlighted in red, on the second month of the year, on the day after the twenty seventh, and after tuesday. la semana blanca is highlighted in blue, on the second month of the year, on the day after the twenty sixth, and after monday. when is the second < < second > > holiday day of christmas?