The Nazi's Final solution was implemented to rid Germany of C) Untermenschen.
The Texas vegetation region which is most densely populated would be D - plain. The reason for this is that there isn't much vegetation going on in Texas, but what is going on is called a plain. This isn't comparable to a subtropic area where the vegetation is very thick and big.
The Truman Doctrine was established to aid nations that were fighting against communism. President Truman highly disagreed with communism, which is what lead him to creating the doctrine.
