________ is the key word in the treatment of eye problems.

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

A．Outside the Town Hall.
B．Near the bank.
C．In Steve’’s place.
D．At the cinema.