Concept:Economic underdevelopment refers to a state of low income, low productivity, and poor living standards.
Explanation:Underdeveloped economies often depend on a single primary product, so a monocultural economy is a common feature.
They also show low life expectancy due to inadequate healthcare and high income inequality.
But high productivity indicates economic development, not underdevelopment.
Underdeveloped economies generally suffer from low labour and capital productivity.
Thus, high productivity is not a feature of economic underdevelopment.
Answer:B. high productivity