To solve this question, the user needs to have knowledge about the methods available for manipulating a ListBox control.
A ListBox is a control that allows users to select one or more items from a list of available options. To remove an item from a ListBox, the control provides several options.
Now let's go through each option and explain why it is right or wrong:
A. Items.RemoveAt - This method removes the item at the specified index position from the ListBox control's Items collection. It removes a single item at a time, so it is the correct answer to this question.
B. Item.RemoveAt - This method attempts to remove an item with a specific name from the ListBox. Since it tries to remove an item based on its name, this option is incorrect.
C. Items.ClearAt - This method does not exist in the ListBox control. Therefore, this option is incorrect.
D. Item.ClearAt - This method does not exist in the ListBox control. Therefore, this option is incorrect.
E. Items.Clear - This method removes all items from the ListBox control's Items collection at once. Therefore, this option is incorrect.
The Answer is: A. Items.RemoveAt