Question

what was the main reason imperial nations built large naval forces?
to initiate sea - based attacks on other nations
to support nearby merchants
to protect their economic interests
to resist attacks on their harbors

Explanation:

Imperial nations aimed to safeguard trade routes, colonies, and resources which were key economic interests. A large naval force was crucial for this protection. While other options had some truth, protecting economic interests was the over - arching reason.

Answer:

C. to protect their economic interests