e’ parameter’s . . . . . . . . property is used to determine the pressed key.

The correct answer is: B. KeyChar

The KeyChar property of the e parameter is used to determine the pressed key. It returns a character that represents the key that was pressed.

The Keypress property returns a string that represents the key that was pressed. It includes the key code and the character code.

The Keychar property is not a valid property.

The Key.Char property is not a valid property.

Here is an example of how to use the KeyChar property:

“`
using System;
using System.Windows.Forms;

public class Form1 : Form
{
public Form1()
{
InitializeComponent();

    // Add a KeyDown event handler to the button.
    Button button1.KeyDown += new KeyEventHandler(button1_KeyDown);
}

private void button1_KeyDown(object sender, KeyEventArgs e)
{
    // Display the character that was pressed.
    MessageBox.Show(e.KeyChar.ToString());
}

}
“`

When you press a key on the keyboard, the KeyDown event is raised. The e parameter of the KeyDown event contains information about the key that was pressed. The KeyChar property of the e parameter returns the character that represents the key that was pressed. In the example above, the KeyChar property is used to display the character that was pressed in a message box.