The statement that is true among the options you provided is:
Race is a social classification based on physical characteristics that do not identify differences in people.
This aligns with the understanding that while race is often perceived in terms of physical traits, such as skin color, hair type, and facial features, these characteristics do not reflect significant biological differences that would substantiate any notion of "superiority" or "difference" in capabilities or cultural traits. The concept of race is more of a social and cultural construct rather than a strict biological categorization.