I need to introduce the background information quick/brief summary details to orient the reader. I am writing about the second one I highlighted

it would most likely be b. your welcome.

eager to consume a lot of food? insatiable appetite?

explanation:

throughout history, economists have always thought  ..

the narrator is a first person, participant one, who describes in the simple past tense important and difficult events in his earlier life. he also provides temporal markers as the month (january) and the time (12: 30 pm). finally the account of his experience is very detailed, to the extent that a participant narrator would talk the same way about his experiences. a good example of such detail is the mention of the “bovril ration” which historically was a native american food adopted by european explorers in arctic and antarctic regions due to its high level of calories.