Answer: Out of the given options, the question that is unfair for a potential employer to ask is:
B. Which race do you belong to?
Step-by-step explanation:
Inquiries about race, ethnicity, or any other form of protected characteristics are generally considered discriminatory and unfair in a job interview or hiring process. Employment decisions should be based on qualifications, skills, and relevant experience, rather than an individual's race or ethnicity. Such questions are inappropriate and may violate laws and regulations pertaining to equal employment opportunity and anti-discrimination measures.
The other questions (A, C, D, and E) are generally considered acceptable and relevant in a job interview. Asking for a candidate's name (A) is necessary for identification purposes, inquiring about high school graduation (C) is a standard educational background question, asking for the address (D) may be needed for future contact or administrative purposes, and inquiring about the previous job (E) is relevant to assess the candidate's experience and qualifications for the position.