A 6 Year Old Boy Was Brought to the Emergency

A 6 year old boy was brought to the Emergency Department by his mother because of increasing pain in the right lower abdomen.A diagnosis of appendicitis was made,and the appendix was removed laparoscopically.A representative section of the appendix is shown in the accompanying high power photomicrograph.Which one of the following is the best diagnosis of the cause of the boy's appendicitis?

A) Entamoeba histolytica
B) Enterobius vermicularis
C) Giardia lamblia
D) Schistosoma haematobium
E) Trichomonas vaginalis