No te vi.
Letter D is the correct answer
Hope this will help
¡Hola!
empezar => yo empiezo (presente)
EMPEZAR <em>preterit tense</em>
yo empecé
tú empezaste
él/ella/Ud empezó
nosotros empezamos
vosotros empezasteis
ellos/ellas/Uds empezaron
☺☺☺
because conocer is used more when you personally know someone/thing
saber is used when you know facts about someone or something.
se is conjugated in the yo form
sabes is conjugated in the tu form so this one is correct because you are asking someone if they know where the party is.