The reference in Genesis Chapter 6 to the union between the 'sons of God' and the 'daughters of men' explains the origin of

A.

Hermaphroditers

B.

Mighty men of renown

C.

Gods and goddesses

D.

Dwarfs

Correct answer is B

There were giants in the earth in those days; and also after that, when the sons of God came in unto the daughters of men, and they bare children to them, the same became mighty men which were of old, men of renown. 

The sons of God here were believed to be fallen angels and in the same verse, the bible describes them as men of renown.

Genesis 6:1–4.