Which of the Following Statements Is True

Which of the following statements is true?

A) Prais-Winsten and Cochrane-Orcutt transformations are consistent when explanatory variables are not strictly exogenous.
B) The SC-robust standard errors cannot be estimated in models with lagged dependent variables.
C) The SC-robust standard errors work better after quasi-differencing a time series that is expected to be serially correlated.
D) Estimation of SC-robust standard errors is independent of the sample size.