Regarding Platyhelminthes : 1. Sexes are separate. 2. Fertilisation is internal. 3. Development is through many larval stages Regarding 1,2 and 3:

Question

( a ) 1 is correct but 2 and 3 are incorrect
( b ) 1 is incorrect but 2 and 3 are correct
( c ) 2 is incorrect but 1 and 3 are correct
( d ) 3 is incorrect but 1 and 2 are correct