The USSR extended its sphere of influence into Yugoslavia and Albania by supporting the communist parties in those countries. Yugoslavia separated from the USSR later on after a fight between those who supported the USSR way of Communism, that is Stalin, and those who supported the socialistic way, that is Tito.
Li Yuan who became emperor Gaozu <span />
Which Roosevelt? There is Franklin Roosevelt and Theodore Roosevelt
A. Alternate interior angles?
Both Gregor Mendel and Alfred Wegener proposed ideas that were not accepted completely by the scientific community during their lifetimes. They had common ideas. They were presented by amateur scientists who were not accepted by the scientific community.
The answer would be letter A.