Directions: Read the passage carefully and answer the questions that follow by selecting the correct/most appropriate options. When it comes to structures that are both majestic and well-fortified, the classic European castle is the pinnacle of design. Across the ages castles changed, developed, and eventually fell out of use, but they still command the fascination of our culture. Castles were originally built in England by Norman invaders in 1066. As William the Conqueror advanced through England, he fortified key positions to secure the land he had taken. Castles also served as bases of operation for offensive attacks. Troops were summoned to, organized around, and deployed from castles. In this way castles served both offensive and defensive roles in military operations. Not limited to military purposes, castles also served as offices from which the lord would administer control over his fiefdom. They would address disputes, handle business, feast, and enjoy festivities. In this way castles served as important social centres in medieval England. Castles also served as symbols of power. The first castles constructed in England were made from earth and timber. Those who constructed took advantage of natural features, such as hills and rivers, to increase defenses. Since these castles were constructed from wood, they were highly susceptible to attacks by fire. Wooden castles were gradually replaced by stone, which greatly increased the strength of these fortifications; however, being made from stone did not make these castles entirely fireproof. Attackers could hurl flaming objects into the castle through the windows or ignite the wooden doors. The demise of castles can ultimately be attributed to gunpowder. During the 15th century, artillery became powerful enough to break through stone walls. This greatly undermined the military role of castles. Castles were then replaced by artillery forts that had no role in civil administration, and country houses that were indefensible. Though castles no longer serve their original purposes, remaining castles receive millions of visitors each year from those who wish to experience these majestic vestiges of a time long passed. Choose a word from the given options which means almost the same as the word 'vestiges' used in the passage.