Which code segment will properly return the TimeSpan returned by the stopWatch variable?

A.
Stopwatch stopWatch = new Stopwatch();
stopWatch.Start();
DoSomething();
stopWatch.Stop();
TimeSpan ts = stopWatch.Elapsed;
string elapsedTime = String.Format(“{0:00}:{1:00}:{2:00}.{3:00}”, ts.Hours, ts.Minutes, ts.Seconds, ts.Milliseconds / 10);
Console.WriteLine(elapsedTime, “RunTime”);
private void DoSomething()
{ … }

B.
Stopwatch stopWatch = new Stopwatch();
stopWatch.Start();
DoSomething();
stopWatch.Reset();
TimeSpan ts = stopWatch.Elapsed;
string elapsedTime = String.Format(“{0:00}:{1:00}:{2:00}.{3:00}”, ts.Hours, ts.Minutes, ts.Seconds, ts.Milliseconds / 10);
Console.WriteLine(elapsedTime, “RunTime”);
private void DoSomething()
{ … }

C.
Stopwatch stopWatch = new Stopwatch();
stopWatch.Start();
DoSomething();
TimeSpan ts = stopWatch.Elapsed;
string elapsedTime = String.Format(“{0:00}:{1:00}:{2:00}.{3:00}”, ts.Hours, ts.Minutes, ts.Seconds, ts.Milliseconds / 10);
Console.WriteLine(elapsedTime, “RunTime”);
private void DoSomething()
{ … }

D.
Stopwatch stopWatch = new Stopwatch();
stopWatch.Begin();
DoSomething();
stopWatch.End();
TimeSpan ts = stopWatch.Elapsed;
string elapsedTime = String.Format(“{0:00}:{1:00}:{2:00}.{3:00}”, ts.Hours, ts.Minutes, ts.Seconds, ts.Milliseconds / 10);
Console.WriteLine(elapsedTime, “RunTime”);
private void DoSomething()
{ … }

Explanation:
Stopwatch Class
(http://msdn.microsoft.com/en-us/library/system.diagnostics.stopwatch.aspx)