When did Yamuna Gases Ltd. Company get the distinction of getting a leading position in the production of gases in Yamunanagar?

When did Yamuna Gases Ltd. Company get the distinction of getting a le

1.	When did Yamuna Gases Ltd. Company get the distinction of getting a leading position in the production of gases in Yamunanagar?
A.	in the year 1973
B.	in the year 1969
C.	in the year 1975
D.	in the year 1972
Answer» D. in the year 1972