What present-day city became the capital of China after the Mongols took over China?

to provide for the common defense to form a more perfect union to promote the general welfare

the answer would more than likely a.)falling crop prices  

hope the answer is right and ,either way have a nice day.

the ansseer is going to be c i think

randy pausch was a famous mathematician, writer and lecturer who is particularly famous for his last speech, given in 2007, "the las lecture", because he illustrates why one's dreams need to be pursued in a logical order if success is to be obtained, option c. at this time, pausch had been diagnosed with terminal cancer so he told the audience to follow their childhood dreams, which were possible to achieve. it has been recognized as one of the best motivational speech around the world.