When the great wall of china was built?
A. 1878 (221 to 206 BC)
B. 1870 (246 to 210 BC)
C. 1978 (300to250)
D. None of these
A. 1878 (221 to 206 BC)
B. 1870 (246 to 210 BC)
C. 1978 (300to250)
D. None of these