What must happen for sexual reproduction to take place in a flatworm?
A male flatworm must meet a female flatworm and mate.
A female flatworm must release eggs into the environment and a male flatworm must fertilize them.
Two individual flatworms must transfer sperm to each other.
Flatworms do not reproduce sexually.

Question

What must happen for sexual reproduction to take place in a flatworm? 
       A male flatworm must meet a female flatworm and mate.
       A female flatworm must release eggs into the environment and a male flatworm must fertilize them.
       Two individual flatworms must transfer sperm to each other.
       Flatworms do not reproduce sexually.

anonymous · Answer

It's C. Two indivitual flatworms must transfer [....] to each other. Because all flatworms have BOTH female and male reproductive systems.