Which of the following statement(s) is/are correct regarding phylum aschelminthes?(i) The body is circular in cross-section hence known as roundworms.(ii) Alimentary canal is complete with a well- developed muscular pharynx.(iii) Sexes are separate (dioecious), i.e., males and females are distinct.(iv) Nephridia help in osmoregulation and excretion.

• A. (i) and (ii)       
• B. (iii) and (iv)
• C. (i), (ii) and (iii)  
• D. All of these