A．As the economy grows, literacy declines下降 because it becomes less and less useful in a developed economy．B．Increased literacy initially最初 stimulates刺激 economic growth by raising提高 labor productivity, but as the economy grows and the opportunity cost機(jī)會(huì)成本 of education rises, literacy declines．C．Increased literacy stimulates economic growth by raising labor productivity, and as the economy grows, people consume消費(fèi) more education．D．There is no correlation關(guān)聯(lián) between economic growth and literacy．