Which list describes materials used in the Colosseum's construction?

• A. wood, lime, straw
• B. stone, iron, clamps
• C. glass, concrete, steel
• D. earth, timber, brick

Answer: (B)

The main idea here is what the Colosseum was built with as its structural materials. Its massive walls and arches rely on sturdy stone blocks, typically travertine, arranged in courses to form a durable exterior and framework. To keep those heavy stones from slipping or shifting under enormous loads, Roman builders used metal clamps and dowels, effectively binding the stone blocks together with iron pieces. Inside, concrete was used for the core and vaults, but the recognizable construction materials described in the option are stone for the blocks and iron clamps to join them.

Other lists mention materials like wood with straw, or glass and steel, or earth and timber, which do not reflect how the Colosseum was actually built at scale. So the combination that matches the real construction approach is stone, iron, and clamps.