I think the answer is C. to preserve the language and heritage of the community.
Answer:
A. van
Explanation:
https://www.dummies.com/languages/spanish/conjugating-the-irregular-spanish-verb-ir-to-go/
In the last row of the table it shows you the verb form for "ustedes"
A and C are the same here but those two is the answer
Duo lingo is a pretty good app