(c) is the correct answer.

...because you will conceive and give birth to a son [Samson].  No razor may be used on his head, because the boy is to be a Nazarite, set apart to God from birth, and he will begin the deliverance of Israel from the hands of the Philistines.".
Judges 13:5

And she made a vow, saying, "O LORD Almighty, if you will ony look upon your servant's misery and remember me, and not forget your servant but give her a son [Samuel] then I will give him to the LORD for all the days of his life, and no razor will ever be used on his head."
1 Samuel 1:11