Parts of a sentence are given below in jumbled order. Arrange the parts in the correct order to form a meaningful sentence.
A great transition / marked / the 20th century / for mankind
1
A great transition marked the 20th century for mankind.
2
The 20th century marked a great transition for mankind.
3
A great transition for mankind marked the 20th century.
4
For mankind, a great transition marked the 20th century.