The Accused Took an Unmarried Girl Below the Age of Sixteen

The accused took an unmarried girl below the age of sixteen without her father consent in a bonafide belief that girl was older than 16 :

A) As the tabbing in itself is unlawful and so cannot avail defence under sec. 79.
B) Accused can take good defence of mistake of fact.
C) Accused cannot take this defence as it is not a mistake of fact
D) None of the above.