Question

The period of first millennium in Common Era (CE) is written as ___________.
A. '1- 100 BCE'
B. '1- 1000 BCE'
C. '1- 100 BC'
D. '1- 1000 CE' or '1- 1000 AD'

Answer 1

Hint:
This period is the one which encompasses the Iron Age in the Old World as well as views the transition from the Ancient Near East to classical antiquity.

The population of the world had roughly doubled over the course of the millennium, from around 100 million to 200–250 million.

Complete solution:
Common Era is referred to as one of the notation systems for the world's most widely used calendar era. The first millennium's period in the Common Era (CE) had begun from 1 CE and ended in 1000 CE or 1-1000AD. The term "Common Era" started to become more widely used in the middle of the 19th century by the Jewish academics.
The first millennium of the anno Domini which is also known as Common Era was a millennium spanning the years from 1 to 1000. The population of the world started to rise more slowly than at the times of the preceding millennium, from around 200 million in the year AD 1 straight about 300 million in the year 1000.

Hence, the correct answer is option D.

Note:
Most of the people use the abbreviations like B.C. and A.D. within a year (for example, A.D. 2012). B.C. signifies "Before Christ," whereas the initials, A.D., stand for Anno Domini, that is Latin for "In the year of our Lord." This system had been devised by a monk in the year 525.
A more recent system uses B.C.E. that stands for "Before the Common Era" and C.E. for "Common Era." This latest system is now widely used as a way of expressing the similar periods as B.C. and A.D., but without the Christian reference. As per this system, one counts time backwards Before the Common Era (B.C.E.) while forwards in the Common Era (C.E.).