B, words written in ink are not easy to fade, because the chemical properties of carbon in ink are stable at room temperature and have nothing to do with the reducibility of carbon, so the choice is wrong.
C, words written in ink are not easy to fade, because the chemical properties of carbon in ink are stable at room temperature and have nothing to do with carbon adsorption, so the choice is wrong.
D, words written in ink are not easy to fade, because the chemical properties of carbon in ink are stable at room temperature, so the choice is correct.
Therefore, choose: d.