Commercial activities among West African countries are greatly hindered by

This question tests knowledge of the barriers to trade among West African countries.

West African countries use different national currencies, such as the naira, the cedi, and the CFA franc, and many of these currencies are not freely convertible or widely accepted outside their own countries. This means that a trader in one country often struggles to pay for goods bought from another country without going through cumbersome currency exchange processes. This problem, the lack of an acceptable medium of exchange across the sub-region, is one of the major factors that hinders commercial activities among West African countries, since money is central to every exchange of goods and services.

The other options do not represent genuine hindrances in the way the question implies. A nationalization decree could restrict trade in a specific country during a specific period, but it is not a general, recurring hindrance across the whole sub-region. Good road networks and having many commercial banks would actually help, rather than hinder, trade, since better roads ease the movement of goods and more banks improve access to financial services; describing them as hindrances would be inconsistent with their real economic effect.

When a question asks what obstructs trade specifically, look for the option describing an actual barrier, not something that is generally a facilitator of trade dressed up as a hindrance.