To my mind, the correct answer is “to help the reader understand how the fuel system on a spacecraft works to help the reader understand the difficult decisions faced by Mission Control”. The aim of including a problem-solution text structure is to organize the author´s ideas in a way that helps the audience to gain understanding of the text. In addition, this device is very useful to call the attention of the audience and to make the text more appealing to them.
The denouement in the plot of a fictional work is the final resolution of all problems that occur within a novel or a play. It is the end result, something that happens when all conflicts are resolved.
