Share Prices of Companies Paying Franked Dividends

Share prices of companies paying franked dividends:

A) should have increased since the introduction of dividend imputation because overseas residents would have sold this type of shares.
B) should have increased since the introduction of dividend imputation because they have become more attractive to Australian investors.
C) have not changed as a result of imputation.
D) should have decreased since the introduction of dividend imputation because overseas residents are unable to use franking credits.