What items were traded in oceania
a. shells to use for money
b. taro and yams
c. fish and shrimp
d. foodstuffs and fuel

b. taro and yams

c. fish and shrimp

Explanation:

Historically, the trade in Oceania has been orientated only around several products, all of which are foods. The most important trading product has been the taro, as it was the most important and valuable source of nutrition in this part of the world. The yams too were traded, though not as much as the taro. Considering that all people living in Oceania had access to the ocean waters, it is no wonder that the fish and shrimp have been used a lot for trade. Certain parts have their specific types of fish and shrimp, so the people of Oceania were getting fish and shrimp that they didn't had in their waters, while exporting ones that they have in abundance but other people in Oceania didn't had.