A client with type 1 diabetes mellitus takes NPH insulin every morning and checks the blood glucose level four times per day. The client tells the nurse that yesterday the late afternoon blood glucose was 60 mg/dL and that she "felt funny." Which statement by the client would indicate an understanding of this occurrence?
a. "My blood glucose levels are running low because I'm tired."
b. "I forgot to take my usual afternoon snack yesterday."
c. "I took less insulin this morning so I won't feel funny today."
d. "I don't know why I have to check my blood glucose four times a day. That seems too much."