"Ravaged by civil war for many years after it gained independence from Portugal, Angola is now one of Africa's success stories: "its" economy grew by 21% last year, and parliamentary elections are to be held later this week"
the above is the CORRECT answer given in the guide.
I am confused that why is it that the "its" cannot be said as a pronoun usage that is ambiguous, i.e., it could refer to Africa's (since both are in possessive case) rather than angola.
It would be of great help if you could sort me out here please.