The correct answer is fourth century, in which fourth is spelled out and century has a lowercase c.
The 4th century.
The 4th century.
The 4th century.
the 19th Century, the 18th Century, the 4th Century BC A century is 100 years
The 4th century.
The 4th century BC.
It is the 4th century BC.
The 4th century BC.
It was in the 4th Century.
It was the 4th century BC.
It is the 4th century BC.
The 4th century BC.