Is one of my hens a roo???

[Clayfly]

I have recently gotten 3 Barred Rock "hens". I am suspicious about one of them being a roo. In the photo you can see that his/her comb is larger and redder than the others. I AM REFERING TO THE MIDDLE CHICKEN...STANDING. The questionable chicken also is making guttural noises and not chirping like the other two. Question. Is it a he or a she?

 

[sourland]

I believe that all are pullets.

 

[MountainWoman73]

A girl. She could be a week or two older than the others, if she's getting her adult voice before them.

 

[mumofsix]

Those are nice pullets

 

[Ol Grey Mare]

All lovely lady birds

 

[cstephens1987]

Those look more like Dominique to me