The fast development of technology and the transition from agricultural to industrial production are the economic features of the European Middle Ages. Therefore, Choices A and D are appropriate.
Historians refer to the time period in Europe from the fall of Rome in 476 CE to the beginning of the Renaissance in the 14th century as the "Middle Ages." The Middle Ages were marked by the Crusades, the growth of political power, intellectual life, military and technology, architecture, art, and music, as well as church life.
In addition, there was a noticeable growth throughout the upper or middle Middle Ages. The time was marked by the emergence of national identity, the restructuring of religious and secular institutions, the growth of the urban population, and territorial and industrial expansion.
As a result, Choices A and D are accurate.
You may read more about the European Middle Ages here:
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CQ
Economically, the European Middle Ages are often characterized by
a. rapid technological advancement
b. unprecedented peace
c. extreme low social mobility
d. a shift from agrarian to industrial output
