The correct option is C Lepidosteus
Protopterus is an African lungfish. Protopterus is the sole genus in the family Protopteridae.
Neoceratodus is an Australian lungfish which has the unique ability to breathe air using a single lung when during dry periods streams become stagnant, or when water quality changes.
Lepidosiren is South American lungfish which is the single species of lungfish found in swamps and slow-moving waters of the Amazon, Paraguay and lower parana river basins of South America.
Lepidosteus is a garfish belonging to the order Lepisosteiformes. The body is covered with smooth enameled scales, of a rhombic form, arranged in oblique rows.
Hence, option D is the correct answer.