The statement that most adequately demonstrates a key idea would be as follows:
A). Change can be a difficult process.
Main Idea
- The statement "Change can be a difficult process" demonstrates a key idea.
- The author attempts to convey that bringing change is an extremely challenging and arduous task.
- The key reason behind this is that people want to remain stuck to their existing ideologies and behavioral patterns.
Thus, option A is the correct answer.
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