If the RR=2.3 and the 95% CI (2.1, 2.9), than one can conclude:

Question

A. The results are statistically significant because 1 is not in the interval
B. The results are statistically significant because 2.3 is in the interval
C. The results are statistically significant because 0 is not in the interval
D. The results are not statistically significant because 2.3 is in the interval

I think the answer is C because the null value (0) is not included in the interval, therefore the results are statistically significant?