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Go with D.) Ustedes, because you are talking to more that one person that you don't know.
Answer: Cultural traditions are important is because it gives you an insight as an outsider from that culture that people from different backgrounds are how the people in that said culture live their lives.
Explanation: For example, if you have a friend who is latino celebrating Dia de los muertos. In your point of view, it’s something that you have never seen or done before but for the majority of latinos who celebrate this day we honor the dead (like family members, pets, babies, etc) by making an ofrenda with pictures of our loved ones and put the things that they loved on the ofrenda so they can take it with them to the land of the dead.
What professions and skills have you learned about?
Querido primo,
Basándome en sus intereses, recomiendo que la profesión que usted persigue sea (the profession they should pursue). Me recomiendes eso porque (why you recommend it). según lo que he aprendido sobre estas profesiones, Creo que será una buena opción para ti.