Why do we light for 8 nights? Wasn't the miracle only 7 nights?

Here are three classic answers given to the famous question of Rav Yosef Caro (among the hundreds that have been offered!)

a. The first day commemorates the miraculous battle victories and the following seven the miracle of the oil. (Pri Chadash , Orach Chaim 670)

b. The menorah miraculously consumed only one-eighth of the oil each night (HaRav Chaim Brisker cited by HaRav Shlomo Yosef Zevin, ‘The Festivals in Halacha’)

c. The first day commemorates the fact the the pure oil was miraculously found at all. (Sefer HaEshkol, Vol. 2, Hilchot Chanukah V’Purim, 6)

Can you think of another answer of your own?