Take context from the input text and decide on the accurate relationship between 'New Democracy' and 'ATHENS' from the options provided.
Options: parent organization, industry, headquarters location, manufacturer

ATHENS (Reuters) - Former Prime Minister Antonis Samaras announced he was stepping down as leader of Greece's conservative New Democracy opposition party after a strong vote for the 'No' position backed by the leftwing government in Sunday's referendum.
headquarters location