B. (1) For the purposes of this Convention, the words "events occurring before 1 January 1951" in article 1, section A, shall be understood to mean either (a) "events occurring in Europe before 1 January 1951"; or (b) "events occurring in Europe or elsewhere before 1 January 1951"; and each Contracting State shall make a declaration at the time of signature, ratification or accession, specifying which of these meanings it applies for the purpose of its obligations under this Convention. (2) Any Contracting State which has adopted alternative (a) may at any time extend its obligations by adopting alternative (b) by means of a notification addressed to the Secretary-General of the United Nations.