The correct answer is: E. No error
The sentence is grammatically correct and has no errors in punctuation or spelling. The word “dialectical” is used correctly to describe a process of development that involves opposing forces. The word “forgiving” is used correctly to describe the process of letting go of anger or resentment. The phrase “rational and moral self” is used correctly to describe the part of a person that is capable of making decisions based on reason and morality.
The sentence could be improved by adding more detail and examples to support the claim that history is a long evolutionary dialectical development. For example, the sentence could mention specific historical events or figures that illustrate this process. The sentence could also be improved by making the language more concise and clear. For example, the phrase “a painstaking forgiving of rational and moral self” could be replaced with the phrase “a process of developing rational and moral self-awareness.”