The correct answer is: A. replace the 900 amount with 910.
The intSales array is declared as follows:
Dim intSales(,) As Integer = {{1000, 1200, 900, 500, 2000}, {350, 600, 700, 800, 100}}
The intSales(1, 3) = intSales(1, 3) + 10 statement will replace the 900 amount with 910.
The first subscript, 1, refers to the row of the array. The second subscript, 3, refers to the column of the array. In this case, the row is 1 and the column is 3. The value of the array at that location is 900. The statement intSales(1, 3) = intSales(1, 3) + 10 will add 10 to the value of the array at that location. The new value of the array at that location will be 910.