Answer:
Option: a. twin towers
Step-by-step explanation:
Romanesque architecture came to Europe after the crusade when Europeans went for religious war. Romanesque designed with arches, vaults, and piers for columns. The twin towers are the main features of the Romanesque style cathedrals. Some example of twin tower cathedral is St. Stephen’s Cathedral, Cologne Cathedral, Notre Dame, etc. Tin towers are beautiful and provide a sense of symmetry.