The answer to each question, taking into account the postcard from Rubén, is:
Translation.
Rubén and Sandra's friendship.
In the postcard sent by Rubén (attached image), Rubén replies to a postcard previously sent by Sandra, in which he tells her that he is writing from the cafeteria of the university where he studies.
On the other hand, he told her about his friends Luis and Marta, something about their hobbies, the likes of Rubén, what they plan to do on the weekend and what he should do before entering his history class.
Taking into account the summary given, it can be identified that all the answers provided are adequate and consistent with the information provided by the postcard.
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