Good explanation of why it's optional in this case, although i'm not convinced that reason is the only reasonable antecedent of why. For example, the explanation why is a common usage,. Why is it that everybody wants to help me whenever i need someone's help?
Understanding the Context
Why does everybody want to help me whenever i need someone's help? Can you please explain to me. I have flunked the exam, that is why i am attending coaching classes. I have flunked the exam, which is why i am attending coaching classes.
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Key Insights
Is there any change in the meaning of sentence. Why should the first person pronoun 'i' always be capitalized? I realize that at one time a lot of nouns in english were capitalized, but i can't understand the pattern of those.