The correct option is
C Postpone
The word, 'adjourn' is a verb which means 'to put off/ postpone'. It also means 'break off a meeting/ game with the intention of resuming it later'. Hence, the word, 'postpone' given in option C is the closest in meaning to this word.
The word, 'decide' is a verb which means 'to come or bring to a resolution in the mind as a result of careful thought'.
The word, 'hasten' is a verb which means 'tobe quick to do something'. It also means, 'to move or travel hurriedly'.
The word, 'continue' is a verb which means 'to persist in an activity or process'.
As all the above three words are quite different in meaning from the word, 'adjourn', options A, B and D are incorrect.