Choice "B" is correct. If a corporation's tentative minimum tax exceeds the regular tax, the excess amount is the alternative minimum tax which is payable in addition to the regular tax.
Choice "a" is incorrect. There is no carryback of the alternative minimum tax.
Choice "d" is incorrect. There is no carryback of the alternative minimum tax.
Choice "c" is incorrect. The excess amount is added to the regular tax to get the total tax liability.
