You Try to Explain the Number of IBM Shares Traded

Multiple Choice

You try to explain the number of IBM shares traded in the stock market per day in 2005. As an independent variable you choose the closing price of the share. This is an example of

A) simultaneous causality.
B) invalid inference due to a small sample size.
C) sample selection bias since you should analyze more than one stock.
D) a situation where homoskedasticity-only standard errors should be used since you only analyze one company.