Certain periods in english history are often referred to by the name of the ruling family, and at the close of the hundred years' war, the line came to power.

Tudor line came into power

Icould be wrong but i would say b.

Ghana, first of the great medieval trading empires of western africa (fl. 7th–13th century). it was situated between the sahara and the headwaters of the sénégal and niger rivers, in an area that now comprises southeastern mauritania and part of mali.