For individuals who are still in pursuit of the answer to this question or for those who wish to verify it, I will list it here.
- The rich depiction of the scenery.
- The narrative told from a first-person perspective.
A detailed portrayal of nature is a typical characteristic of a memoir. Memoirs consist of recollections from the author’s actual experiences, allowing them to narrate these events with greater specificity compared to someone who simply invents a story.
Most memoirs are composed in the past tense and from a first-person perspective. This approach is utilized as they reflect on genuine occurrences from their earlier life. While not every memoir adheres to this format, it remains the prevailing standard, which Shackleton's work exemplifies. In Shackleton's "South!", the first-person narrative style prevails.
The remaining choices are irrelevant here.
There is no place for "imagination" in memoirs, as these works recount factual occurrences (or are expected to be factual). Therefore, the first two options can be dismissed.
Additionally, a third-person perspective does not apply, since as previously mentioned, Shackleton's "South!" is narrated from a first-person viewpoint.