To address the contradictory findings regarding the high failure and success rates of small businesses in Soweto, Lunga should formulate a question that directly investigates the metrics or criteria used to assess success. Therefore, the most appropriate question would be:
What success metrics are being used in the studies of small businesses in Soweto?
This question would help clarify the basis for the reported success and failure rates, allowing for a more nuanced understanding of the performance of small businesses in that area.