下列反应的离子方程式正确的是(  )

A．向AgNO₃溶液中滴加氨水至过量：Ag⁺+NH₃·H₂O＝AgOH↓+NH₄⁺

B．向Mg(OH)₂悬浊液中滴加FeCl₃溶液：3Mg(OH)₂+2Fe³⁺＝2Fe(OH)₃+3Mg²⁺

C．向Na₂S₂O₃溶液中加入足量稀硫酸：2S₂O₃^2-+4H⁺＝SO₄^2-+3S↓+2H₂O

D．向苯酚钠溶液中通入少量CO₂气体：

When analyzing a firm’s reconciliation between its effective tax rate and the statutory tax rate, which of the following is NOT a potential cause for the difference between the effective rate and the statutory rate （）

A. Deferred taxes provided on the reinvested earnings of unconsolidated domestic affiliates.  

B. Tax credits.  

C. Use of accelerated depreciation for tax purposes and straight-line depreciation for reporting purposes.