Read the following context and choose the best option to answer the question.
Context: I went to his house and his mom said he only ate a Peach for dinner . When we work together he always has dizzy spells or says " head rush " both of which I know are caused by lack of eating . I feel really bad for him and I would love him to get better , but at the same time I almost like having him around for competition . He knows I have a slightly altered affliction with food but he does n't know how much .
Question: Why did the speaker 's friend suffer a head rush and feelings of faintness after eating only a peach ?
Options: 
A. They have low blood sugar , due to the lack of a substantial amount of food taken in
B. They have developed diabetes , and their blood sugar is out of whack , they need insulin
C. They have been overeating most of the day , and are exhausted for this reason alone
D. They ate so little because they are abusing amphetamines , which also cause weakness


A