According to the text the World War II poster was an ideal agent for what

To mobilize a nation. Inexpensive, accessible, and ever-present, the poster was an ideal agent for making war aims the personal mission of every citizen

Explanation:

  b.

there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.

glass wants to live in a world of super heroes and villains. he have lived all his life trying to be responsible for the creating the origin story of a super hero; he schemed and caused many incidents (many of them fatal) hoping that someday someone with superpowers would show up and save the day.

he knew himself very much. he saw himself as a villain of a real-life super hero story. he was aware of his strengths (more than smart enough for being manipulative and scheming) and weaknesses (having fragile bones and having to rely on his mind to succeed).