The answer to your question is c.invented because it's a past participle.
D. We need to appreciate every moment of our lives.
The third-person point of view used by Sinclair is intended
to achieve his resolution, by focusing on what Jurgis understands and feels. The narrator concentrates on the main character Jurgis, his
emotions and his thoughts, and the readers also get an perception on other
minor characters’ thought processes.
