Answer:
Silver has been produced in Virginia primarily as a by-product of lead, zinc, copper and gold mining. Most of Virginia's silver production has come from the Virgina District in Halifax County, the Mineral District in Louisa County, and mines in Prince William, Goochland, Spotsylvania, Orange and Buckingham counties.
Explanation:
The correct answer is - C. 1975 - 1999.
The period between 1975 and 1999 was a period in which the world population grew for around 2 billion people. Even thought that is the same rise as in the period between 1930 and 1975, still this period is shorter, and is just 24 years the world population grew from approximately 4 billion people to approximately 6 billion people.
C is severely limited by "elastic clause