Strawberry farmers want to investigate two different pest control procedures in terms of the yield. Therefore, 12 fields were randomly selected: one procedure was adopted in 6 of the fields, and the other procedure was adopted in the other 6 fields. The number of healthy strawberry plants in each field is given by: Procedure1 20 20 23 22 24 18 Procedure2 11 8 9 11 27 10 Calculate a 95% confidence interval for the difference in average yield. A. [2.53, 14.47] B. [1.05, 15.95] C. [1.72, 15.28] D. [2.18, 14.82]