The keys to the success of the mongolian military in the 1200s included

a fleet of powerful ships.
a single of squad of soldiers.
organized troops on horseback.
rifles and other advanced weapons.

The correct answer is the 3rd option.

C) Organized troops on horseback

The keys to the success of the Mongolian military in the 1200s included organized troops on horseback. Option C is correct.

The Mongol Empire was present in history during the 13th and 14th centuries and was the largest contiguous land empire. It originated in Mongolia, and extended from Eastern Europe and parts of Central Europe to the Sea of Japan, stretching northwards into Siberia, eastwards and southwards into the Indian subcontinent, Indochina and the Iranian Plateau; and westwards as far as the Levant and the Carpathian Mountains.

#1 im pretty sure its a.

might be agreeing to participate ethically with other european nations in the slave trade

or notifying other european nations when taking possession   of african territories