According to Australia's Foreign Minister Alexander Downer, the Australian was most probably held hostage on ______

A．was a journalist working for Australia's SBS Arabic radio service
B．was a leader of militants who held an Australian hostage
C．was a Muslim leader designated to rescue the hostage
D．was the American to whom the hostage was married

A．is one of the largest oil producers and exporters in the world
B．has done better in fighting against poverty than against unemployment
C．is encountering great dissatisfaction with its oil development in the Niger delta
D．is faced with high unemployment and continued poverty throughout the country