The mongols successfully attacked china’s walled cities with
a. machine guns.
b. cannons.
c. hot oil dropped from balloons.
d. greek fire. reset selection

The correct answer is B. cannons. In fact, the Mongol conquest of China was the fist documented usage of cannons - around 1340s. The world's frist cannon was found in Mongol-dominated Manchuria. 

The  pan-african movement  was an "emotional, cultural, psychological and ideological  movement  that began among the  african  dispora in the western hemisphere, for a closer  purpose, so that  african  people could feel secure, attain political, economic as well as psychological power visa vis other races or world regions" .