Which statement about market risk is true?

Market risk, or systematic risk, arises from factors affecting the entire market, such as changes in inflation or interest rates, and cannot be fully eliminated through diversification. The feedback from the document states:

"Once a portfolio becomes well diversified, the only remaining risk to be concerned about is market risk. Market risk is defined as the variability of a stock or a portfolio in relation to the market as a whole. The process of diversification cancels out much firm-specific risk, so market risk is less than the total risk you would calculate if you looked at each stock separately. Market risk is also referred to as systematic risk and arises from such things as inflation, the business cycle, and interest rates."