手足口病的病因是（）。

A.病因不清，多种因素共同作用

B.长期使用激素，免疫力降低，婴幼儿

C.病毒感染

D.螺旋体感染

E.局部刺激

Selected information from Kentucky Corp. ’ s financial statements for the year ended December 31 was as follows (in $ millions) : Property, Plant & Equip. 10 Accumulated Depreciation (4) Deferred Tax Liability 0.6 The balances were all associated with a single asset. The asset was permanently impaired and has a present value of future cash flows of $ 4 million. After Kentucky writes down the asset, Kentucky’ s tax accounts will be affected as follows ( the tax rate is 40 percent) :（）

A. deferred tax liability will be eliminated and deferred tax assets will increase $ 0.2 million.  

B. deferred tax liability will be eliminated and tax assets will increase $1.4 million.  

C. income tax expense will decrease $ 0. 8 million.