You are developing a C# application. The application includes the following code segment,
(Line numbers are included for reference only.)
The application fails at line 17 with the following error message: “An item with the same key
has already been added.”
You need to resolve the error.
Which code segment should you insert at line 16?
A.
Option A
B.
Option B
C.
Option C
D.
Option D
A