The nordic nations share as a common economic activity because of their close proximity to the ocean.
a. shipping
c. farming
b. fishing
d. lumber

Fishing (for coldwater fish in the Northern Atlantic Ocean)

This question is an opinionated one, and we don’t know anything about the module or anything, thus we can not answer it. but if you are having trouble on what it is asking basically it is just asking to (using your knowledge on the topic) say which topics you were most interested and which were the most challenging.hope this : p