Are Age, sex and race are the only characteristics in the protected class?

Under federal law, employers cannot discriminate on the basis of race, color, national origin, religion, sex, age, or disability. The law is not, however, a blanket bar on employers taking into account a person's membership in one of these groups in all circumstances

Explanation:

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answer: a. the kind of population living in your neighbourhood.

the census explorer data tool by the us census bureau allows the user to zoom in on any neighbourhood within the united states and find the kind of people residing in that by race and age.  

the tool needs to needs to be used twice – once in order to find what type of people reside in a neighbourhood, and then to see the age groups of the people in the same neighbourhood.