The correct option is B Specialised organelles
The protozoans possess highly efficient locomotory structures (cilia, flagella, pseudopodium etc), competent life cycle (trophozoite to cyst stage and vice versa) and diversified nutritional modes (holophytic, holozoic, pinocytosis, saprozoic, mixotrophic and parasitic), by their specialised organelles like glycosomes, cytostomes, (9+2) microtubular flagella and cilia, hydrogenosomes, acidocalcisomes, endosomes, lysosomes and secretory organelles of the endocytic pathway etc.
Hence, the correct answer is option (D).