In Which of the Following Cases Can the Alter Ego

In which of the following cases can the alter ego doctrine be invoked in a corporate civil case?

A) when shareholders bring a lawsuit on behalf of the corporation after the corporation failed to do so itself
B) when unpaid creditors are trying to collect from shareholders a debt owed by the corporation
C) when there is mismanagement of corporate stocks by the board of directors
D) when shareholders are trying to collect for fraud committed by a third party