Perhaps the closest the beatles ever came to a reunion while all were still alive was when they all appeared on self-titled 1973 album, though not all on the same tracks.

The correct answer is Ringo's.
In 1973, all of the Beatles (Lennon, McCartney, and Harrison) collaborated with Ringo Starr on his album Ringo. This happened three years after their breakup as a band, and was the only time they met again for a 'reunion.' This is the correct answer as Ringo was the only one who had a self-titled album in 1973.