question: Q:A 62-year-old man with small cell lung cancer undergoes radiation therapy. His oncologist explains that radiation causes DNA damage and double strand breaks and this damage stops the cancer cells from growing because they can no longer replicate their DNA. One key mediator of this process is a cell cycle regulator called P53, which is upregulated after DNA damage and helps to trigger cell cycle arrest and apoptosis. One mechanism by which P53 activity is increased is a certain chromatin modification that loosens DNA coiling allowing for greater transcription of the proteins within that region of DNA. Which of the following enyzmes most likely causes the chromatin modification described in this case?? 
  {'A': 'DNA methyltransferase', 'B': 'Histone acetyltransferase', 'C': 'Histone deacetylase', 'D': 'Histone methyltransferase', 'E': 'Xist'},