A chi-squared test was performed using these results. The resulting p-value was less than 0.01. Which of the following 95% confidence intervals for the relative risk of reinfection for subjects randomized to the Intervention group compared to subjects randomized to the control group is consistent with this p-value, and with the RR of 0.63?

a. 1.17 to 2.12

b. -0.30 to -0.07

c. 0.47 to 0.85

d. 0.44 to 1.12