Si viajas entre méxico y los estados unidos para tu trabajo, es importante que a. seas bilingüe b. sepas dos idiomas c. comprendas las dos culturas d. all of the above

D.All of the above

Explanation:

Since answers A an B are the same

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.