[android-developers] How to clear activity stack

My application has two activities A, B.

Initially application launches with A activity(root activity), and
then it launches the B activity and finishes A activity. Now B
activity on the foreground.
User pressed Home Button on B activity it launches HOME Screen, user
launches the application it launches A activity(intentional) and on
the background B activity still there.
When user presses back (finish() method call) on A activity it goes to
B activity.
Is there any way to clear the activity stack trace when application
launches again i want to clear the B activity from activity stack if
it exists.

Any suggestions please...?

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