Based on the information in the table, the following options can be evaluated:
A. Sudan invests more in capital goods than Nigeria. - This statement cannot be concluded directly as the percentages provided do not specify what aspect (like capital goods investment) they represent.
B. Egypt is more economically specialized than Nigeria. - This statement is not valid based on the given percentages as well, which do not provide information about economic specialization.
C. South Africa has a higher standard of living than Sudan. - The percentages are not indicative of standard of living directly, so this conclusion cannot be drawn either.
D. Nigeria has more barriers to trade than South Africa. - The information provided does not specifically relate to trade barriers, making this conclusion unfounded.
Given the options, none of them can be reasonably concluded based solely on the information provided in the table.
However, if we consider the percentages as potentially representative of some economic indicator (such as investment in capital goods or economic efficiency), one might lean towards A being a possibility depending on context, but again, it's not definitively supported by the data given.
In conclusion, without additional context or clarification on what the percentages represent, none of the options can be definitively determined as reasonable conclusions. Thus, the answer is that none accurately represent conclusions based on the information provided.