Step 1: Match Specific Characteristics: C. Mouth with three chitinous lips: This is the most diagnostic feature of \textit{Ascaris lumbricoides} (Roundworm), which has a triradiate mouth guarded by one dorsal and two ventrolateral lips. Therefore, C matches with I.
D. Nocturnal periodicity: The larvae (Microfilariae) of \textit{Wuchereria bancrofti} reside in deep blood vessels during the day and migrate to peripheral circulation at night (10 PM - 4 AM) to coincide with the feeding habit of the vector (\textit{Culex} mosquito). Therefore, D matches with II.
B. Ovoviviparous: Female \textit{Wuchereria} does not lay eggs but releases juveniles (microfilariae) directly. This condition is called ovoviviparity. Therefore, B matches with V (Female \textit{Wuchereria}).
A. Curved posterior end...: Sexual dimorphism in nematodes often involves the male having a curved tail with copulatory spicules (pineal setae). While \textit{Ascaris} also has this, item C has already claimed \textit{Ascaris}. Thus, this description applies to the remaining male nematode in the list, Male \textit{Wuchereria}. Therefore, A matches with III.
Step 2: Final Sequence:
A - III, B - V, C - I, D - II. This corresponds to Option (D).
