Economic development refers to
a. economic growth
b. economic growth plus changes in output distribution and economic structure
c. improvement in the well-being of the urban population
d. sustainable increases in gross national product

a. economic growth

Explanation:

Economic development means a type of method during which specific economic well-being furthermore features of the life of a country, province or district society is developed. This article has been adapted regularly during the 20th and 21st centenaries, though this theory has survived within the West for centenaries. "Modernization", "Westernization", and especially "industrialization" signify separate terms frequently utilized while addressing economic development. Whereas economic development exists as a policy mediation effort trying to enhance the well-being of personalities, economic growth remains a sensation of market fecundity also a growth in GDP. Consequently, while being economist Amartya Sen denotes, "economic growth exists one perspective about the specific method of economic development"

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