If adult platyhelminthes go through a major transformation to develop reproductive organs, then when do platyhelminthes reproductive organs develop?

Answer choices:
- when they become adults
 - It helps them survive
 - produce offspring
 - By wind and rain
 - during the day
 - members of their own species
 - an area swollen with pus
 - Something coming from a gland

 

 when they become adults         