Which code should you use to replace line 05?

You are developing an application.
The application contains the following code segment (line numbers are included for reference only):

When you run the code, you receive the following error message: “Cannot implicitly convert type ‘object” to ‘inf.
An explicit conversion exists (are you missing a cast?).”
You need to ensure that the code can be compiled.
Which code should you use to replace line 05?

A.
var2 = ((List<int>) array1) [0];

B.
var2 = array1[0].Equals(typeof(int));

C.
var2 = Convert.ToInt32(array1[0]);

D.
var2 = ((int[])array1)[0];

Explanation:
Make a list of integers of the array with = ( (List<int>)arrayl) then select the first item in the list with [0].