Sentences of a paragraph are given below in jumbled order. Arrange the sentences in the correct order to form a meaningful and coherent paragraph.

A.The Olympic Games have come to be regarded as the world's foremost sports competition.
B.Olympic Games is an athletic festival that originated in ancient Greece and was revived in the late 19th century.
C.Before the 1970s, the Games were officially limited to competitors with amateur status, but in the 1980s many events were opened to professional athletes.
D.Currently, the Games are open to all, even the top professional athletes in basketball and football (soccer).