Final answer:
Charlie's increase in intelligence transforms his understanding of personal mistakes, creates questioning about his knowledge, and may result in less understanding towards others. Most significantly, it leads to increased isolation and loneliness due to a growing intellectual gap with those around him. The correct option is C) It makes him less understanding of others.
Step-by-step explanation:
The changes in Charlie's intelligence as portrayed in the story have a profound impact on his life. While increased intelligence brings the opportunity for self-improvement and a deeper understanding of the world, it often leads to a sense of isolation from others who may not share or understand the same level of intellect.
As Charlie's intelligence grows, he begins to recognize the mistakes he's made in the past, becomes more introspective and critical of what he knows, which could make him question what he really knows.
However, it may also make him less understanding of others since he now operates on a different level of thinking.
Ultimately, this growth in knowledge and personal insight can lead to increased isolation and loneliness, as his relationships with others are strained by the new differences between their perspectives and capabilities.
The correct option is C) It makes him less understanding of others.