Answer: c) Tammy and Sara have different concepts of dog
Step-by-step explanation:
According to the described situation in question, Tammy thinks that dogs can bite children whereas Sara thinks that they are more sort of friendly animals. This displays that they both have different idea and theory about dog as they both have different understanding for it.
Other options are incorrect because different classification, features and members of borderline are not the subject on which the understanding about dogs in Tammy and Sara are distinguished. Thus, the correct option is option(c).