General Knowledge When the great wall of china was built? Options:A. 1878 (221 to 206 BC)B. 1870 (246 to 210 BC)C. 1978 (300to250)D. None of theseView AnswerA. 1878 (221 to 206 BC) Continue Reading Previous: In regard of precautionary measures what is meant by HSE?Next: When was Panama Canal Officially Opened?