Why has China developed faster than Nigeria?
The question contains two elements. The first is what is meant by ‘development’ and on what basis we could say country A ‘develops’ faster/before than country B. The second part is to examine the comparative evidence from China and Nigeria. You need to examine both internal and external factors and what elements of development you consider important (and why).
Regarding sources, I would suggest looking at the UNHDR and World Bank websites and relevant journal articles from World Development and the Journal of International Development (both are in the library and can be accessed electronically).