Castles Often Formed the Nucleus of New Towns Because

Castles often formed the nucleus of new towns because:

A) knights were important consumers of goods.
B) castles became more important than monasteries after 1100.
C) castles provided protection for merchants who lived close to the walls.
D) lords would offer merchants who would trade at the castle a break on taxes.
E) traveling merchants often stopped at castles for trade.