The correct answer is C. 3.
The Do While loop will continue to execute as long as the condition intCount > 3 is true. The first time the loop executes, intCount is 0, so the condition is true and the loop body is executed. The MessageBox.Show("Hello") method is called, and intCount is incremented to 1. The next time the loop executes, intCount is 1, so the condition is still true and the loop body is executed again. The MessageBox.Show("Hello") method is called again, and intCount is incremented to 2. The third time the loop executes, intCount is 2, so the condition is false and the loop terminates. Therefore, the MessageBox.Show("Hello") method is called 3 times.
Option A is incorrect because the MessageBox.Show("Hello") method is called 3 times, not 0 times.
Option B is incorrect because the MessageBox.Show("Hello") method is called 3 times, not 1 time.
Option D is incorrect because the MessageBox.Show("Hello") method is called 3 times, not 4 times.