In this task, you are given a question and a context passage. You have to answer the question based on the given passage.

Between abbeys and tradesmen, which was an architectural undertaking?, Context: The major architectural undertakings were the buildings of abbeys and cathedrals. From about 900 CE onwards, the movements of both clerics and tradesmen carried architectural knowledge across Europe, resulting in the pan-European styles Romanesque and Gothic.
abbeys