To measure the amount of human capital available in a country, it would be best to determine
a the literacy rate of that country
b the comparative advantage of the most profitable exported goods
c the trading partners of that country
d if the nation is rich in natural resources

To measure the amount of human capital available in a country, it would be best to determine the literacy rate of that country. The Percentage of population aged 15 years and over who can both read and write with understanding a short simple statement on his/her everyday life. Generally, this would help in measuring human capital.