Select the most more appropriate option to fill in the blank.

The ______of our civilization from an agricultural society to today’s complex industrial world was accompanied by war.

metamorphosis

The most appropriate option to fill in the blank is metamorphosis.

The word "metamorphosis" means a transformation or change in form or nature. In this context, it refers to the dramatic transformation of our civilization from an agricultural society to a complex industrial world. This transformation was not easy or peaceful. It was accompanied by war, conflict, and social upheaval.

The other options are not as appropriate.

• Route refers to a way or path from one place to another. It is not the best word to describe the transformation of our civilization because it does not capture the magnitude of change that occurred.
• Migration refers to the movement of people from one place to another. It is not the best word to describe the transformation of our civilization because it does not capture the totality of change that occurred.
• Emigration refers to the permanent movement of people from one country to another. It is not the best word to describe the transformation of our civilization because it does not capture the fact that the transformation was not just about people moving, but also about the way we lived and worked.