Which is right?

In the phrase un autobús con ovejas, ovejas means:

On sunday, january 2 is of the month. january 2 is sunday and the celebration of independence in my country. what kind of day is sunday january 2? the festive week the new year the eve of the year holiday

Which adverb of time best completes this sentence? yo estaba leyendo el periódico, mi padre estaba viendo el noticiero. a. aún b. mientras c. todavía d. entonces