Answer:
D. Invasion.
Step-by-step explanation:
As per the question, the 'invasion' novel trespass the readers' fear of attack and trains readers in urban warfare as this genre reviews the pre-world war I era and describes the German invasion of Britain. It aims to reflect the perturbation and angst regarding speculative assaults by foreign faculties. Such novels employ imageries of warfare allegorically to show objection against military dominance and social miseries. These novels intend to criticize military strength by taking advantage of urban warfare. Thus, option D is the correct answer.