"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

D?

No, how long have you been writing to each other, tú y Marta = c. se escriben

Sra

Correct! The correct answer is D.

To find the answer, look at the response given by the person in the conversation. The person says "Desde que ella fue a Costa Rica" which translates to "Since she went to Costa Rica." This indicates that the action of "se encuentran" (they meet) began when Marta went to Costa Rica.

Option A, "se dan la mano" (they shake hands), is not mentioned in the response given.

Option B, "se dicen 'Hola!'" (they say "Hi!"), is not mentioned in the response given.

Option C, "se escriben" (they write to each other), is not mentioned in the response given.

Therefore, the correct answer is D, "se encuentran" (they meet).