fish:rabbit$=3:1$  wheat:rabbit$=3:2$  fish: wheat$=2:1$ 
$10000$ years ago, Owen the fisher traded $3$ fishes for $1$ rabbit from Oscar the hunter. Then, Oscar traded $2$ rabbits for $3$ packs of wheat from Dennis the farmer. How many fishes should Owen give Dennis for a pack of wheat? 
Options:
1) $$1$$ 
2) $$2$$ 
3) $$3$$ 
4) $$4$$ 