You run an OLS model with three explanatory variables. The p-values for the coefficients on the first two variables are 0.02 and 0.03, respectively. For the third variable, the p-value is 0.12. What can you say about the significance of the coefficients on the three variables? A-The coefficients on the three variables are all insignificant, using a significance level of 1% B -The coefficient on the third variable is significant, using a significance level of 5% C -The coefficients on the first two variables are significant, using a significance level of 5% D-The coefficients on the first two variables are significant, using a significance level of 1%.