final answer please

Two independent samples of sizes 15 and 20 are randomly selected from two normal populations with sample variances s. = 250 and s, - 200, respectively, but population variances are known to be approximately equal. Which of the following distributions should be used for developing confidence intervals and for testing hypotheses about the difference between the two population means (#1 - (2)? O The standard normal distribution. The t distribution with 34 degrees of freedom. O The t distribution with 33 degrees of freedom. O The t distribution with 29 degrees of freedom. O The t distribution with 28 degrees of freedom