What do Platyhelminthes exhibit in contrast to Annelids?

Which of the following is an acoelomate animal with a protandrous nature?

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:

Which of the following is an example of a digenetic Platyhelminthes?

The characteristics of a tapeworm are:
$(A)$ Large,quadrate scolex,without rostellum and hooks
$(B)$ Primary host man,and secondary host cattle
$(C)$ Length $5$ to $10$ metres
Identify the tapeworm.

Which of the following is true for $Taenia$?