According to the passage, what is the major driving force behind the progress toward more literacy

A．the religious reforms
B．the translation and popularization of the Bible
C．the availability of printing technology and cheap paper
D．the renovations of the teaching methods

A．The progress of literacy was dominated successively by economy, religion and politics.
B．During the early Middle Ages, with the increase of commerce, literacy became largely confined to the church.
C．The economic aspect is the most related to the man' s reading ability.
D．In the period of the Renaissance, the great expansion of religion and business led to a revival in literacy.