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 form the options given below:

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.