Please answer and explain why. Thank you!

A researcher has developed a new drug designed to reduce blood pressure. In an experiment, 21 subjects were assigned randomly to the treatment group and received the new experimental drug. The other 23 subjects were assigned to the control group and received a standard, well-known treatment. After a suitable period of time, the reduction in blood pressure for each subject was recorded. A summary of these data is:

		n	sample mean	s
	Treatment group (new drug):	21	23.48	8.01
	Control group (old drug):	23	18.52	7.15

If we use the more accurate software approximation to the degrees of freedom (Option 1), we would have used which of the following for the approximate number of degrees of freedom for the t procedures?

37

38

40

100