Read the following context and choose the best option to answer the question.
Context: 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 ?
Options: 
A. They could not have the real thing
B. Polystyrene is not very durable
C. Stonhence was not made of wood
D. None of the above choices .


A