Answer:
The right option is D.
Explanation:
The Zulus lived in separate clans, without a common leader, similar to the Mongols who also lived in separate clans and were only united under Genghis Khan's rule. Shaka managed to unite his people, and also conquered several other tribes. In a few years, he had over 200.000 new followers coming from his conquests.
The Mongol empire was known for allowing its conquered folks to still keep their lifestyles, as long as they were loyal to them. They did not destroy everything they touched, and only wiped out those clans who directly opposed them.
Shaka was also similar, as his goal was to rule over a vast territory. When he first came to power, his tribe was composed of about 1500 people and even fewer warriors. But by the time of his death, he ruled over about 500.000 people, from all the territories and tribes he conquered.
Shaka had two half brothers, who made at least 2 failed assassination attempts on Shaka. After that, with support from the Mpondo people, Shaka was killed by 3 assassins, in 1828.