Final answer:
Accession is not a basic appraisal principle; it is a legal concept related to property improvement or growth, unlike Progression, Regression, and Change which directly relate to real estate valuation.
Step-by-step explanation:
The answer to the student’s question, 'Which of the following is NOT one of the basic appraisal principles: a. Progression, b. Regression, c. Change, d. Accession?' is d. Accession. The basic principles of appraisal relate to how the value of real estate is affected. These principles include Progression, which refers to the impact of more valuable properties on less valuable ones; Regression, the opposite, where less valuable properties affect more valuable ones; and Change, which acknowledges that property values are always in flux due to various factors. Accession is not a basic appraisal principle; instead, it pertains to the legal concept describing the addition of value to property through the addition of new improvements or the natural growth of land.