What best explains the code above?

Consider the following code:

Intent i = new Intent(this, MainActivity.class);

i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

startActivity(i);

What best explains the code above?
A . The activity being launched is already running in the current task, then instead of launching a new instance of that activity, all of the other activities on top of it will be closed and this Intent will be delivered to the (now on top) old activity as a new Intent.
B . Any existing task that would be associated with the activity to be cleared before the activity is started.
C . A new Activity will be launched and it will be on the top of the stack
D . A new activity will be launched but will be in full-screen mode.

Answer: A