Which of the following are the general characters of Platyhelminthes?
(a) Dorso-ventrally flattened body
(b) External fertilisation 
(c) Development is indirect 
(d) Sexes are separate

• A

  (a) and (b)

• B

  (a) and (c)

• C

  (b) and (c)

• D

  (b) and (d)