Correct! They were the offspring of God's angels and young women.
Can't God maintain better control over his libidinous troops? This is scandal in high places.
"And it came to pass . . . That the sons of God saw the daughters of men that they were fair; and they took them wives of all which they chose. . . . There were giants [nephilim] in the earth in those days; and also after that, when the sons of God came into the daughters of men, and they bear children to them, the same became mighty men which were of old, men of renown." (Genesis 6:1-4)
This is obviously mythical. The "sons of God" were angels: "the expression clearly refers to divine beings."
(Harper's Bible Dictionary) The word
nephilim "could mean 'fallen ones' and allude to stories in related cultures of rebellious giants defeated by the gods in olden times (cf. Isa. 14:12)."
(Harper's)
Some suggest this is why Paul admonished Christian women to keep their heads covered in church, so as not to sexually tempt the angels: "For this cause ought the woman to have power on her head because of the angels." (I Corinthians 11:10)
They were the result of an earlier, botched creation. Wrong answer.
They were monsters from the evil nation of Nephi. Wrong answer.
They were part of the "blessing of Abraham" that ensured military victory to God's chosen people. Wrong answer.