问题
单项选择题
Refusing to invest in companies that sell tobacco products, alcohol, or products that are harmful to the environment would constitute a set of investment restrictions that would best be classified according to which one of the following investment constraint categories（）
A. Factors that are considered to be either legal or regulatory.
B. Style investing.
C. Unique needs and preferences.
答案
参考答案：C
解析：
These ethical issues fall under the heading of individual investor concerns. Some investors would exclude these types of investments due to their own personal preferences.