Colliding like doomed galaxies ?
I would presume that the one that has to do with academic skills such as thinking. I think its researching. Hope it helps :)
The one line which if written in iambic pentameter (meaning that the sequence of syllables is: unstressed first, stressed second, and consisting of 10 syllables/5 meters) is A) I lift my lamp beside the golden door.
The answer is materialism. This is evident as the narrator wishes to go to a remote cabin in the woods and essentially live off the land while depriving himself of human contact and engaging with nature. No mention of religion is made in the passage, nor is there any concepts of turmoil that the narrator makes note of. Instead, he talks of his willingness to move to Innisfree, to live in a cabin simply, as he views it as his purpose.