The correct answer is D, domestication of animals. All other alternatives refer to events that only happened later.
In order to affirm an Agricultural Revolution ocurred, historians have to choose the most important changes and events that determine that from that moment onwards life was different.
The most important thing that supports the idea of an Agricultural Revolution is that humans started to domesticate plants and animals, which made possible for them to settle and stop being nomads.
This lead to the birth of cities and to radically change how those people lived.
What question are you asking
I believe the answer is pointed arches, correct me if I'm wrong.
Romanesque architecture has thick stone walls, small windows, and rounded arches. I do not believe they have any pointed arches. As you can see in the photo attached there are all of the above, except pointed arches.
Hope this helps!
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