please help

"Desde cuando _____ tu y Marta?" "Desde que ella fue a Costa Rica."
a. se dan la mano
b. se dicen "Hola!"
c. se escriben
d. se encuentran

since when ...... you and Marta? since that...?
i don't understand athe question or the answers please help

1 answer

Since when ________ Martha and you? Since she went to Costa Rica.

a. they sh ake hands
b. they say "Hi"
c. they write to each other
d. they meet

Remember that 3rd person plural, in addition to "they" can be "you-all."

Sra