From the figure below, which displays the proportion of immigrants in countries across the world in 2020, it is clear that … . Population graph (Our World in Data) a. North America has a greater immigrant population than South America b

Based on your description, I cannot see the figure or the details within it. However, I can provide general insights regarding the immigrant populations of the mentioned countries. 

**North America vs. South America**: North America typically has a higher percentage of immigrants, especially in the United States, compared to South American countries.
  
**Australia's Immigrant Population**: Australia is known for having a significant immigrant population relative to its total. It's unlikely to have the lowest immigrant population.

**South Africa vs. Brazil**: South Africa has a notable number of immigrants, particularly from neighboring countries, but it would need specific data to accurately compare it with Brazil.

**India's Immigrant Population**: India has a large Diaspora globally but does not necessarily have the highest immigrant population within its own borders compared to others.

**China vs. India in Immigrant Population**: Historically, China has had a lower proportion of immigrants than India, but again, this would depend on specific data.

Please refer to the population graph you mentioned to determine which statement is most accurate according to the data presented.