Question

father thinks elsina might like to be a trader, like him. this means she would trade
a music for food.
b whales for fish.
c shells for rocks.
d fish for fresh water.
\im a digger,\ said the girl. \you know that fresh water you traded the fish for? i found it.
fisher folk wanted more for their catch, and landers wanted more for their fresh water,
squeezing father between them.
\your brother knew his path at your age. a born net-maker.\ father paused. \i thought you
would like to be a trader. like me.\

Explanation:

The text mentions "that fresh water you traded the fish for", which directly indicates a trade of fish for fresh water.

Answer:

D. fish for fresh water