Question

At the beginning of which century the world population was one billion?
a. twentienth century
b. twenty first century
c. nineteenth century
d. seventeenth century
give the correct answer otherwise write nothing​

Answer 1

Answer:

20th century

Step-by-step explanation:

It is estimated that the world population reached one billion for the first time in 1804. It was another 123 years before it reached two billion in 1927, but it took only 33 years to reach three billion in 1960...

$hope \: my \: answer \: helps \: u$

Answer 2

at the beginning 20 century the world population was one billion