An Obese 50-Year-Old Woman, Whose Height Is 5 Ft 4

An obese 50-year-old woman, whose height is 5 ft 4 in (160 cm) and weight is 220 lb (100 kg) , decided to lose weight. She lost 45 lb (approximately 20 kg) over a period of 6 months, and then had an attack of biliary colic and required a cholecystectomy. The gallbladder stones identified by the pathologist were most likely

A) pigmented stones
B) calcium oxalate stones
C) cholesterol stones
D) bilirubin carbonate stones
E) lithocholate stones