Which of the Following Statements Is Correct

Which of the following statements is correct?

A) Generally speaking, investors interpret a firm's decision to repurchase their own stock as a positive signal.
B) A stock repurchase may be viewed as a sign that the firm doesn't have enough attractive capital budgeting projects.
C) The IRS can impose penalties on a firm if tax authorities can show that the repurchase was performed primarily to avoid dividend taxation.
D) All of these are correct.