Which of the Following Is the Reason Why Standard Errors

Which of the following is the reason why standard errors measured by OLS differ from standard errors measured through Prais-Winsten transformation?

A) OLS standard errors account for serial correlation, whereas Prais-Winsten estimations do not.
B) Prais-Winsten standard errors account for serial correlation, whereas OLS estimations do not.
C) Prais-Winsten standard errors account for heteroskedasticity, whereas OLS estimations do not.
D) OLS standard errors account for heteroskedasticity, whereas Prais-Winsten estimations do not.