Exhibit 15-5.The accompanying table shows the regression results when estimating . Refer to Exhibit 15-5.At the 5% significance level,which explanatory variable(s)is(are)individually significant? A)Only x₁ B)Only x₃ C)x₁ and x₂ D)x₂ and x₃

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In the table, the t-values for x₁ and x₂ are both greater than the critical t-value at the 5% level of significance (2.306). Therefore, these two explanatory variables are individually significant. The t-value for x₃ is less than the critical t-value, so it is not individually significant.