The graph likely illustrates the economic disparities between different racial groups in South Africa during the apartheid era, highlighting the effects of apartheid policies on economic success. Based on the options you provided, the most accurate interpretation would be:
While White South Africans were already more wealthy than other groups, apartheid further expanded these differences.
This suggests that apartheid policies entrenched and exacerbated existing economic inequalities by favoring White South Africans while marginalizing other racial groups, leading to a significant gap in economic success and income levels. The other statements either downplay the impact of apartheid on economic differences or inaccurately suggest that all groups benefited equally, which does not align with historical evidence.