A Student Nurse on a Medical-Surgical Floor Is Caring for a 62-Year-Old

A student nurse on a medical-surgical floor is caring for a 62-year-old previously healthy female. The patient has been admitted for an infectious disease work-up. She has been experiencing generalized pain and nausea for the past three weeks, and recently developed a fever. The student nurse prepares to assist the RN in collecting blood for the following lab tests: complete blood count (CBC) , C-reactive protein (CRP) , eosinophil sedimentation rate (ESR) , blood culture, urine culture, and a lumbar puncture with cerebral spinal fluid (CSF) culture and cell count. The nurse is also collecting a sputum culture, as well as a respiratory PCR by nasopharyngeal suction.
-The patient's respiratory PCR results are reported as "insufficient cells available for testing." Which of the following statements by the student nurse indicates proper understanding of the findings? 

A) The patient is free of infection since insufficient cells could be isolated.
B) A smaller sample must be sent,since the irrigation solution volume diluted the cells.
C) This is a very specific and sensitive finding that points to a viral infection.
D) The sample was inadequate,and the nasopharyngeal specimen collection must be repeated.