question: Q:A group of 6 college students with multiple sclerosis (MS) was evaluated for flares in a neurology clinic. The results are shown in the figure. Each row represents a patient. The gray bars represent the duration of the flare. The arrowheads indicate that disease was already present before and/or persisted beyond the timeframe of the study. Based on the figure, which of the following is the most valid statement about MS flares in this group of students?? 
  {'A': 'Incidence from April 1st to June 1st was 3', 'B': 'Incidence during the month of May was 2', 'C': 'Incidence during the month of February was 3', 'D': 'The year-long prevalence was 4/6', 'E': 'Prevalence of the disease on May 15 was 4/6'},