The question "Why does South African state view the global political system as fundamentally unjust, unequal and discriminatory?" fits into A. Ontology.
Ontology deals with the nature of being, existence, or reality, often exploring how entities are categorized and the relationships between them. In this case, the question is probing the underlying beliefs and assumptions held by the South African state regarding the nature and structure of the global political system.
While one might consider elements from the other categories, the primary focus here is ontological in nature.