To solve this problem, we need to match the items in List I with their corresponding features in List II. Let's analyze each item:$\newline \bullet$(a) Metamerism:$\newline$ - Metamerism refers to the segmentation of the body into a series of repetitive segments.$\newline$ - This characteristic is found in the phylum Annelida.$\newline$ - Therefore, (a) matches with (iii).$\newline \bullet$(b) Canal system:$\newline$ - The canal system is a network of water channels found in sponges, which belong to the phylum Porifera.$\newline$ - Therefore, (b) matches with (iv).$\newline \bullet$(c) Comb plates:$\newline$ - Comb plates, or ctenes, are characteristic of the phylum Ctenophora.$\newline$ - They are used for locomotion.$\newline$ - Therefore, (c) matches with (ii).$\newline \bullet$(d) Cnidoblasts:$\newline$ - Cnidoblasts are specialized cells that contain stinging organelles called nematocysts, found in the phylum Coelenterata (Cnidaria).$\newline$ - Therefore, (d) matches with (i).$\newline$Now, let's match the items from List I with List II:$\newline (a) \rightarrow (iii), (b) \rightarrow (iv), (c) \rightarrow (ii), (d) \rightarrow (i) \newline$This corresponds to Option 3.