The Saint Helena Constitution took effect in 1989 and provided that the island would be governed by a Governor and Commander-in-Chief, and an elected Executive and Legislative Council. In 2002, the British Overseas Territories Act 2002 granted full British citizenship to the islanders, and renamed the Dependent Territories (including Saint Helena) the British Overseas Territories. In 2009, Saint Helena and its two territories received equal status under a new constitution, and the British Overseas Territory was renamed Saint Helena, Ascension and Tristan da Cunha.
Try to answer this question if possible (otherwise reply "unanswerable"): In 2002 what act granted full British citizenship to the citizens of the islands?
British Overseas Territories Act 2002