Arrange the following in the sequence of their influence on Harappan urban development:
A. Introduction of copper-bronze technology.
B. Emergence of planned cities like Mohenjodaro and Harappa.
C. Construction of standardized drainage systems.
D. Development of long-distance trade with Mesopotamia.
1
A,B,C,D
2
A,D,B,C
3
A,C,D,B
4
A,B,D,C