Answer:Yo conoci Luisa ayer
Explanation:It wouldnt be the word saber for 1 because saber is "to know" so talking about something or a place that you know.
Conocer is "to meet or "to know"(talking about people)
so now we know were talking about a person we need to use conocer. er and ir verbs in the past tense end with "i" when using "Yo"
so therefor we know the answer is "Yo conoci Luisa ayer"
hope this helped:)