Jenny Is a 13-Year-Old Hare Krishna Who Follows a Vegan

Jenny is a 13-year-old Hare Krishna who follows a vegan diet. She has not been performing as well as her non-vegetarian study friend on math tests and has been very upset about it. The teacher reports to Jenny's mom that she does not appear focused during lessons and can't seem to concentrate on her school work. What may provide a likely explanation? ​

A) Jenny's diet doesn't provide enough energy for her to stay alert.
B) Jenny's diet provides insufficient bioavailable iron and she may be anemic.
C) Jenny's diet contains insufficient calcium and protein, which impairs intellectual performance.
D) The high fiber content of Jenny's diet increases the urge to evacuate, which interferes with her ability to concentrate.