The correct option is A Full control over the coastal regions
China was under traditional rule by the Manchu Dynasty from 1644 to 1911. During these years, they had established a stringent trade control over the coastal region. However, foreign powers had carved out special areas of interests in China, referred to as, ‘spheres of influence’, and they forced the emperors to give them concessions in these special areas like low tax rates, freedom to maintain their armed forces, and immunity from the Chinese law.