Concerning the prophecy in Isaiah 7:14 regarding a sign given by the Lord, what was the primary significance of the 'Immanuel' title given to the child?

A It was primarily a prediction of the child's physical appearance. B It indicated that the child would literally be God incarnate, fully revealing God's divine nature. C It signified God's presence and protection for Judah during a time of crisis, serving as a symbol of hope and deliverance. D It was solely a reference to the child's future role as a political leader of Israel.