Discussion
Which mineral had a continuous decrease in production over the given years from 1991-92 to 1993-94?
Answer: B
Copper is the mineral whose production decreased continuously from 1991-92 to 1993-94. Its production was 310, 298 and 288 thousand tonnes in the three years, so it fell in each year.
Lead was 112, 160 and 126, so it rose in 1992-93 and then fell. Nickel was 232, 238 and 248, so it rose every year. Zinc was 98, 108 and 96, so it rose and then fell. A continuous decrease needs a fall at both steps, and only copper has that.
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