Which of the following situations related to oral chemotherapy treatment is most likely to result in serious adverse effects? A. The new cycle of treatment is delayed because the medication is unavailable from the pharmacy B. A patient misses a follow-up appointment because he is unable to pay for transportation to the clinic C. A family member brings the medication bottle and dosing schedule to the follow-up appointment D. A patient obtains a refill of the prescription and continues to take the medication during the "off week"