Answer:
C. strong-form efficiency argument
Step-by-step explanation:
"Strong form efficiency argument" theory best reflects the practical and realistic theory about the pricing of any portfolio.
This includes the widest information, as it includes all the internal facts.
This theory believes that there is no importance or additional benefit of knowing any internal information of the stock or portfolio concerned, as that is reflected on the trading price of the stock or portfolio.
Generally this theory deals with stock pricing and not with all of the portfolio.