My stepmother was limping for the rest of the day , unfortunately , and she avoided walking more than necessary . The Stonehenge replica was so - so ; it was made of concrete , so it looked a bit silly . Still , it was mildly amusing to see .

Question: why was the Stonehence monument made of concrete ?
Answer: They could not have the real thingPolystyrene is not very durableStonhence was not made of woodNone of the above choices .