Which of the following best describes the relationship关系 between economic growth and literacy识字率？

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机会成本 of education rises, literacy declines．

C．Increased literacy stimulates economic growth by raising labor productivity, and as the economy grows, people consume消费 more education．

D．There is no correlation关联 between economic growth and literacy．