25- 1 poinl A July 2020 article in the New England Journal of Medicine reports the results of a randomized trial designed to assess the efficacy of Hydroxychloroquine in preventing Could-19 infection in persons exposed to others with Could-19. There were 821 subjects enrolled in this study. Of the 414 randomized to the treatment (Hyd roxychloroquine) arm, 49 (11.8%) developed Covid (or probable Covid) within 14 days of randomization. 0f the 407 randomized to the placebo arm, 58 (14.3%) developed Could (or probable Covld) within 14 days of randomization. Compute a 95% CI for the risk difference from Item 24. (Note. 51:61,,me 1'5pm)) = 0.024 when rounded to 3 decimal places: you may verify this on your own if you wish.) a. (-0.073,-0.023). or (-7.3%, - 2.3%) b. (0.023.0073). or (2.3%, 7.3%) c. (-0.073,o.023). or (-7.3%, 2.3%) d. (-0.023,0.073). or (-2.3%, 7.3%)