The Huns were<em> nomads</em> who lived in Central Asia, Caucasus and Eastern Europe,<em> they contributed to the fall of the Western Roman Empire because they started the</em> Mass Migration.
The mass migration was a main factor on the Western Roman Empire because<em> it weakened the Roman Empire's cultural, economic and military development</em>, leaving them exposed for other countries to attack.
The Hun invasion<u> </u><u>caused a massive migration</u>, they moved <em>The Goths</em> from their homes causing <em><u>the Goth invasion of the Roman Empire</u></em>. This is known as the <em>Domino Effect</em> in the fall of the Western Roman Empire.
D. To grant more freedom of speech to some citizens
Tutu mentions all of the following grievances of black South Africans except impossibility of blacks' obtaining jobs as diamond miners. The correct option among all the options that are given in the question is the last option or option "d". The other options given in the question were mentioned by Tutu.