Final answer:
The subject of this question is Social Studies.
Step-by-step explanation:
The subject of this question is Social Studies. Social Studies is an academic discipline that integrates various fields of study, including history, geography, economics, and political science, to explore societies, cultures, and the relationships between individuals and communities.
To insert the dashes correctly, the sentence should read: —Johannesburg, South Africa's largest city and the seat of its Constitutional Court, has served as the home for such luminaries as Desmond Tutu and Nelson Mandela.
The dashes are used to set off the non-essential information within the sentence, providing additional context about Johannesburg without altering the main structure of the sentence.
Johannesburg, being a large, modern city supporting extensive mining and agricultural activities, is indeed significant as the residence of renowned figures such as Mandela and Tutu, and as the location of the Constitutional Court.