In "the seafarer" the dominant impression of the speaker's life at sea is one of

The dominant impression is that the life in the sea is a difficult one and solitary, but often voluntarily chosen. It's like some sort of a voluntary exile that is difficult but we choose it for ourselves. It's harsh and difficult but for people who do it it's the only way and they couldn't do it other way.

This would be third person because they are using the correct pronouns that belongs to third person like he, the name, etc

The answer is b. new mexico