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A. since the 1950s
B. since the 1960s
C. since the 1970s
D. since the 1980s
Answer
B. since the 1960s
Submitted by: Engr. Abdul Hafeez
A. since the 1950s
B. since the 1960s
C. since the 1970s
D. since the 1980s
Submitted by: Engr. Abdul Hafeez
