Please Read the Clinical Scenario, and Then Answer the Question

Multiple Choice

Please read the clinical scenario, and then answer the question that follow to become familiar with the traditional NCLEX question format.
Marie is a 57-year-old female who is on your general medical-surgical unit with a bladder infection. Two weeks ago, she was having slight burning upon urination. She self-treated with an increased intake of cranberry juice, but did not see any improvement. In fact, her symptoms got worse. Last week, she developed generalized abdominal pain and a mid-grade fever. She did not come into the hospital until the pain was unbearable and she had a fever of 104F. She was admitted to your unit and started on multiple IV antibiotics. The doctors say that she could be developing a kidney infection.
-Knowing that Marie's primary organism causing her UTI is

A) T helper cells
B) T cytotoxic cells
C) natural killer cells
D) B cells
E) coli,which cells are being activated by this infection?