Tammy and sara both agree that dogs typically have four legs, a tail, and fur. tammy thinks that dogs also tend to bite small children while sara thinks they tend to be friendly. what explains the differences between what tammy thinks and what sara thinks?
a. tammy and sara have different borderline members of the category of dogs. b. tammy and sara have different categories of dogs. c. tammy and sara have different concepts of dogs. d. tammy and sara have different necessary features of dogs.

c) Tammy and Sara have different concepts of dog

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).