Los señores ramirez ya se habían antes de conocer a mi mamá (conocer).

This sentence is written in Preterite pluperfect tense, also called pluperfect or Past Perfect which is used to talk about actions that were completed before some point in the past and in spanish has the following structure:

Note in spanish the verbs must be conjugated according the subject and must match in genre and number.

So, the sentence is written with the third person in plural ellos (they), which are the Ramirez, therefore the correct conjugation of the verb conocer (to meet, in this context) in Past Perfect tense is:

And the complete sentence is:

Messrs. Ramirez had met before they met mom

the answer is c. estudió

explanation:

to translate: last year a group from my school went to cuba and studied the history of the island. you would use preterite form because it was one time and they use fue in the sentence.