This should be common sense. Considering this is Brainly though, the answer is A signaling indicating danger or the need for help
Rhetorical questions add a level of cheesiness to the paper and unless you are a very good writer, and I mean college professor level, then you will most likely fail at any attempt. Also writing research papers your suppose to be telling the reader what they don't know instead of asking them what is already do know.
A journal written by frontier settlers will most likely not mention Manifest Destiny much. This was an idea that permeated policy, but it was rarely openly stated, especially among common people. However, the journal is likely to mention some ideas related to Manifest Destiny, such as the superiority of Western culture.
A journal of this type is also likely to mention how life was at the "frontier" and how American Indians struggled to keep their lands. It would also outline the difficult situations that settlers faced, such as being alone, being exhausted and being attacked by Native Americans.