Answer:
D.All of the above
Explanation:
Since answers A an B are the same answer:
A - Seas bilingüe (that you're bilingual)
B - Sepas dos idiomas (that you know two languages)
And that either one of them is a valid answer.. that means you cannot just pick one of them, you have to pick both.
Since C. Comprendas las dos culturas (that you understand both cultures) is also a valid choice... that means the answers are A, B and C....
So, the final answer is D - All of the above.