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 MessageBox.Show method is executed. The value of intCount is then incremented to 1. The next time the loop executes, intCount is 1, so the condition is still true and the MessageBox.Show method is executed again. The value of intCount is then incremented to 2. The next time the loop executes, intCount is 2, so the condition is still true and the MessageBox.Show method is executed again. However, the next time the loop executes, intCount is 3, so the condition is false and the loop terminates. Therefore, the MessageBox.Show method is executed 3 times.
Option A is incorrect because the MessageBox.Show method is executed 3 times, not 0 times.
Option B is incorrect because the MessageBox.Show method is executed 3 times, not 1 time.
Option D is incorrect because the MessageBox.Show method is executed 3 times, not 4 times.