下列鉴别方法可行的是 [ ]

A．用氨水鉴别Al³⁺、Mg²⁺和Ag⁺

B．用Ba(NO₃)₂溶液鉴别Cl^-、SO₄^2-和CO₃^2-

C．用品红鉴别CO₂和SO₂

D．用KMnO₄酸性溶液鉴别CH₃CH=CHCH₂OH和CH₃CH₂CH₂CHO

In any given year, the chance of a good year is 40 percent, an average year is 35 percent, and the chance of a bad year is 25 percent. What is the probability of having two good years in a row（）

A. 16.00%.

B. 10.00%.

C. 8.75%.