What is main idea of the secret life of walter mitty?

In this unit we learned about arguments and rhetoric. in an argument we use ,not informal language

The missionaries who appear in the novel are colonists from a) britain b) portugal c) spain d) italy

Evaluate the argument in president kennedy’s inaugural address for sacrificing oneself for the greater good of humanity. is this argument convincing? in what ways can we see the legacy of his request in this word today.