A. Southern and Eastern Europe.
The Lincoln–Douglas debates (also known as The Great Debates of 1858) were a series of seven debates between Abraham Lincoln, the Republican candidate for the United States Senate from Illinois, and incumbent Senator Stephen Douglas, the Democratic Party candidate.
D: The organization of political parties.
Compared with the North, the South had less industry. The North relied on factories and industrial workers to fuel their economy, whereas the South depended heavily on agriculture.
<em>I don´t understand why there is a fee</em> is a declarative sentence.The sentence states that there is something that is not understood.
For the sentence to be exclamatory it needs an exclamation mark at the end:
<em>I don´t understand why there is a fee is a declarative sentence !</em>
For this sentence to be interrogative, it needs a question mark at the end and an auxiliary before the main verb: <em>Do you understand why there is a fee?</em>
Finally, to be imperative, it needs the imperative structure that requires no subject:
Don´t understand why there is a fee is a declarative sentence! This last is really not a probable option in normal speech.