The correct option is
C Renounce
'Abjure' means refusing and rejecting formally. E.g. He abjured his religion of dissipation. 'Renounce' means refuse to continue to recognize or abide by. 'Discuss' means to talk about something with a person. 'Perjure' means to lie under oath. 'Run off secretly' means no longer in existence.
Thus, option B is the most appropriate synonym of the given word.