Triploblastic acoelomate animals are

Given below are two statements.
Statement $I$: Cephalic ganglion appears like $U$ shaped structure in Hydra.
Statement $II$: Ventral nerve cords are connected to each other by commissure in a ladder like manner in Planarian.
In the light of above statements,choose the most appropriate answer from the options given below:

What is prominently observed in Planaria?

Flatworms are $...$

$A$ metazoan covered by cilia is

Which of the following statements is incorrect for the phylum $Platyhelminthes$?