Please state me which is the best dog from below?

A purebred dog is more likely to have multiple health problems than a shelter dog "mixed" breed will. Plus, buying a dog from a breeder just encourages the over population of dogs. You would be doing a better thing by getting your dog at a local animal shelter. But if you want a purebred, you can contact multiple shelters and have them contact you when the breed you desire comes up for adoption. Golden and Labs are the best dogs out of the ones you listed for children - they are very protective, kind, loving, understanding, smart and easy to train. You can find labs at your local shelter on a regular basis. Good luck - make adoption your first option.