Final answer:
The best example of a dimension of diversity among the choices given is 'gender identity', as it represents a key aspect of an individual's personal identity. The correct answer is option: b. gender identity.
Step-by-step explanation:
The concept of dimension of diversity refers to the different characteristics and attributes that can vary among individuals, contributing to their unique identities and experiences in society. An example of a dimension of diversity is gender identity, which denotes an individual's personal sense of their gender, which may or may not correspond with the sex they were assigned at birth. It is considered as an internal, deeply-held sense of being male, female, a blend of both, neither, or something else entirely, and is a central aspect of a person's identity.
Contrastingly, the medical model typically refers to the way medical professionals view disability or illness, which is not principally a dimension of diversity but a conceptual framework.
Stereotypes are oversimplified generalizations about groups of people, which do not represent dimensions of diversity but rather potential misconceptions or biases towards them.
Finally, intersectionality is a framework for understanding how various aspects of a person's social and political identities might combine to create unique modes of discrimination and privilege, and while it relates to diversity, it is not an example of a single dimension of diversity, but rather a concept that encompasses the interaction of multiple dimensions.