The correct statement is: "Don't judge him, he's a teenager. Being rebellious is one of the problems of this age”. Therefore, the correct option is A. "Judge" is the closest match to "Don't judge" in the first blank. "Mind" is more focused on having consideration towards someone, and "be hard on" implies a harsh reaction, neither of which is appropriate in this context. And for the second one, "problems of this age" is a reasonable fit, whereas "problems of this age's" is grammatically incorrect. "Scold" also does not quite fit this context, as it implies a parental or disciplinary role.