Apps Finish activity from another activity

[Tollas]

I have 3 activities, activityA, activityB & activityC. I want to add a menu button NEW SEARCH that will destroy/finish all 3 and start a new activityA.

I do not want to finish the activities as they process as I want the user to be able to navigate between the 3 unless the NEW SEARCH menu option is chosen.


Basically I want to know how to finish activityA & B from activityC.


Thanks!