The first one is the one that English teachers look for. Although a professional research paper is important, it can be accomplished without multiple sources.
Plagiarism is only the case when that one source is the only writing in your paper, or you didn't cite the source.
As for the length, I can make a pretty strong point in one paragraph.
Your answer would be “The most memorable trip was when my brother and I encountered a bear.”
-Visible
-In sight
-Viewable
-Evident
-Detected
-conspicuous- obvious/easily see
I would need to see a picture of the actual problem to answer but id you’re looking for an explanation as to what you need to do read the poem and connect the lines to the one that describes the feeling of the poem.