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.
Joseph is a 6-year-old male presenting to your pediatric office with chickenpox. He has had his infection for about 1 week, and his mom is concerned about Joseph’s 8-year-old sister, Judith, because she had a long, painful infection of chickenpox 2 years before. Of note, Joseph was not vaccinated against chickenpox when he was younger, because his mom did not think it was that serious of a virus, and she wanted to spare him the extra injection.
-Which cells will keep Joseph from becoming infected again?

A) T helper cells
B) natural killer cells
C) T memory cells
D) B cells