The correct option is A Abdication
The word for the phrase 'A king voluntarily giving up his throne' is Option A, Abdication. Option B, 'Resurrection' is the fact or act of bringing someone back to life. Option C 'Accession' means acquisition of position of rank or power. Option D 'Renunciation' is a formal announcement that someone doesn't believes or supports something. Thus, options B, C and D are incorrect and the correct word for the given phrase is Option A, Abdication.