The answer choice that is the most important to a well-diversified investor in common stocks is A) Market risk
This refers to the term that describes and defines the risk possibility of an investor making losses based on market factors that have an effect on the performance of the financial markets
Hence, it can be seen that from the other risks mentioned: B) Specific risk, C) unsystematic risk, D) Diversification risk, they do not have such importance to a well-diversified investor in common stocks than market risks.
Read more about market risk here:
https://brainly.com/question/23969100
#SPJ1