The sentence that is an example of pronoun usage error is the last one - D. The audience left its seats after curtain call.
Instead of <em />the pronoun <em>its, </em>you should use <em>their. </em>
Unnecessarily is what the word means
The reader can infer that <span>Dave is like a child because all of his pay is given to his mother.
Considering that he is still 17 (but he already wants to own a gun), he is still relatively young and it is reasonable that his pay goes to his mother.</span>
Even though option D is also related to Modernism and could be related to the excerpt, option C seems to be the correct one: It conveys the idea of isolation from modern life.
Modernist were called "the lost generation" because of their search for meaning among the fragments of modern life. In the excerpt, the words "lonely men" seem to address the theme of isolation and alienation in society. While everyone seems to have a role to perform in modern life, that does not mean they have found their true identity. Some sort of value seems to have been lost and, with it, men lost themselves. Modernism is characterized by the search of such value.
D. The enemy is crafty, unscrupulous, experienced in deception.
This is the best choice. By calling the enemy crafty, unscrupulous, experienced in deception, Stalin is feeding the hatred the people have for the enemy. He is detailing the traits that are not desired and makes the people feel as though they are justified in their efforts to defeat the enemy. These details are also insulting to the enemy and could also be used to incite the enemy.