I am going to have to put down #!
A. because it says brother-in-law's in should be brother-in-laws
Dependent clause + independent clause= complex
The correct answer for this question is this one:
<em>All free men, wherever they may live, are citizens of Berlin, and, therefore, as a free man, I take pride in the words "Ich bin ein Berliner!"</em>
That line shows that people should be patriotic. As much as possible, they have to support their own nation.
Hope this helps answer your question and have a nice day ahead.