Final answer:
Qualitative research is the most suitable research approach for justifying the closure of startups in Africa.
Step-by-step explanation:
The most suitable research approach for justifying the closure of startups in Africa would be qualitative research. Qualitative research involves collecting and analyzing non-numerical data such as interviews, focus groups, and content analysis to gain a deep understanding of the experiences and perspectives of individuals. In the case of studying startup closures in Africa, qualitative research would allow researchers to explore the factors, challenges, and experiences of entrepreneurs and stakeholders involved in the closure process.