Living in the central Australian desert has its problems,______ obtaining water is not the least.

A．for which

B．to which

C．of which

D．in which

某人为计算n!(0＜n＜=12)编写了下面的函数过程： Private Function fun(n As Integer)As Long Dim p As Longp=1For k=n-1 To 2 Step-1 p=p*kNext kfun=p End Function 在调试时发现该函数过程产生的结果是错误的，程序需要修改。下面的修改方案中有3种是正确的，错误的方案是______。

A．把p=1改为p=n

B．把For k=n-1 To 2 Step-1改为For k=1 To n-1

C．把For k=n-1 To 2 Step-1改为For k=1 To n

D．把For k=n-1 To 2 Step-1改为For k=2 To n