The correct answer is option 1), i.e. continue. Carry on: (phrasal verb) to continue an activity or task.Let us try to find the meaning of the words given i the options- Delay: (verb) to make someone or something late or slow.Stop: (verb) to cause an action, process, or event to come to an end or simply come to an end Postpone: (verb) to cause or arrange for something to take place at a time later than that first scheduled.So, only option 1 gives us the correct answer.