The following risk ratios give the increased risk for various diseases comparing two groups (exposed vs. unexposed).

a. 2.5 (2.0, 3.0)
b. 1.03 (1.02, 1.04)
c. 6.0 (.85, 9.8)
d. 0.98 (0.88, 1.08)
e. 0.20 (.05, 1.05)

Which risk ratios are statistically significant at the 0.05 level? You may choose more than one.