After the Nurse Has Finished Teaching a Patient About Taking

After the nurse has finished teaching a patient about taking oral ferrous sulfate, which patient statement indicates that additional instruction is needed?

A) "I will call the doctor if my stools start to turn black."
B) "I will take a stool softener if I feel constipated occasionally."
C) "I should take the iron with orange juice about an hour before eating."
D) "I should increase my fluid and fiber intake while I am taking the iron tablets."