Of the long history three outstanding characters have been especially mentioned by Xi Jinping, president of China. They are _____.

A、Alisher-Navoi,thefounderofUigherliterature;
B、UlughBeg,anemperorastronaut;
C、Khwarizmi,“thefatherofalgebra”;
D、TimurShahDurrani,theruleroftheDurraniEmpire