The answer would be D concrete. The Eiffel Tower is built of wrought iron, not steel, and while aluminum and copper may have been used for electrical purposes or other minor details, they were not essential for the tower's construction. Instead, giant concrete slabs enabled Eiffel to built the over 7,000ton structure without it sinking into the ground or tilting.
A major difference between Japanese Samurai and European Knights during the Middle Ages is that only Knights "<span>C. Received land in payment for their services," since in Japanese culture such land grants were not seen as being honorable. </span>
