单项选择题
You write the following code segment to call a function from the Win32 Application Programming Interface （API） by using platform invoke.
string personName = "N？el"；
string msg = "Welcome " + personName + " to club ’’!"；
bool rc = User32API.MessageBox（0， msg， personName， 0）；
You need to define a method prototype that can best marshal the string data.
Which code segment should you use？（）
A.A
B.B
C.C
D.D
