question: Q:A 17-year-old girl presents to the family doctor with fever, headache, sore throat, dry cough, myalgias, and weakness. Her symptoms began acutely 2 days ago. On presentation, her blood pressure is 110/80 mm Hg, heart rate is 86/min, respiratory rate is 18/min, and temperature is 39.0°C (102.2°F). Physical examination reveals conjunctival injection and posterior pharyngeal wall erythema. Rapid diagnostic testing of a throat swab for influenza A+B shows positive results. Which of the following statements is true regarding the process of B cell clonal selection and the formation of specific IgG antibodies against influenza virus antigens in this patient?? 
  {'A': 'The first event that occurs after B lymphocyte activation is V(D)J recombination.', 'B': 'During antibody class switching, variable region of antibody heavy chain changes, and the constant one stays the same.', 'C': 'Deletions are the most common form of mutations that occur during somatic hypermutation in this patient’s B cells.', 'D': 'V(D)J recombination results in the formation of a B cell clone, which produces specific antibodies against influenza virus antigens.', 'E': 'After somatic hypermutation, only a small amount of B cells antigen receptors have increased affinity for the antigen.'},