Read the Following Scenario and Answer the Question Below

Read the following scenario and answer the question below.
After meeting with their instructor, Pablo and Johanna know that they need to change their experimental design. They contact a local puppy farm and arrange to do their study with 3- month- old litters of pups from four Irish setters, for a total of 24 puppies consisting of 12 females and 12 males.
-In order to have two groups of puppies (control and experimental) , Pablo and Johanna should _________

A) put 6 males and 6 females in each group, with some from each litter in each group
B) randomly choose one dog for the control group and use the other 23 in the experimental group
C) put all the puppies from two of the litters in one group and all of the puppies from the other two litters in the other group
D) put the 12 females in one group and the 12 males in the other group
E) flip a coin for each dog to see which group it will be in