A time period of thousand years is called a Millennium.
Millennium is derived from the Latin word "mille" means "thousand" and "annum" means "year".
"Millennia" is the plural of Millennium.
The time period from January 1, 2000 to December 31, 2999 is equivalent to one millennium.
A. 3000 years
B. 300 years
C. 30 years
D. 3 years
Correct Answer: A
Step 1: Millennium is a span of thousand years.
Step 2: Three millennia = 3 × 1000 = 3000 years.