Please help with this matching question thank you

The following are very small data sets of human birth weights (in kg) of either singleton births or individuals born with a twin. Singleton: 3.5. 2.3". 2.6, 4.4 Twin: 3.4, 4.2. 1.? Indicate whether each of the following sets of numbers (items a through f} is a possible permuted sample for use in testing the difference between the means of singleton and twin birth weights. If not, select the answer with the appropriate reason(s} why. Singletons Twins Is it one of the possible permutations? a. 3.5, 23'. 2.6, 4.4 3.4, 4.2, 1.? b. 3.4,4.2, 1.7, 3.5 2.7, 2.6, 4.4