A 26 Year Old Medical Student Reported Epigastric Pain and Discomfort,often

A 26 year old medical student reported epigastric pain and discomfort,often around exam time.Upper GI endoscopy was performed,which reveal oedematous,reddish gastric mucosa.A biopsy was done,a representative section of which is shown in the accompanying photomicrograph.The right panel shows a Cresyl violet special stain.Which one of the following is the best diagnosis?

A) Gastric adenocarcinoma
B) Giardia lamblia
C) Helicobacter pylori gastritis
D) Peptic ulcer
E) Psychosomatic "tummy ache"