21 does anyone know mandarin? if so how do you say the number 2540? answer in pinyin and characters, no translator

Which sentence includes a transition that best shows the sequence or signals a shift in time? for years i put off the business of tidying them up, just as i am putting it off now. a) meanwhile, for years i put off the business of tidying them up, just as i am putting it off now. b) for years afterwards, i put off the business of tidying them up, just as i am putting it off now. c) for years simultaneously, i put off the business of tidying them up, just as i am putting it off now. d) at the same time, for years i put off the business of tidying them up, just as i am putting it off now.