B. Many health experts say that Africa’s poverty and politics are to blame for diseases that in most developed countries are easily preventable. International health agencies set out more than two years on a $2 billion campaign to stamp out the global threat of polio, the world’s largest-ever health initiative. They believed they could eradicate the virus by the end of this year. Not any more. In Africa, which has most of the world’s polio cases, politics and armed conflict have played a major role in stalling the polio eradication program. In northern Nigeria, government officials suspended the polio program two years ago after rumors spread that the vaccine caused sterility and AIDS. Health workers sent in to vaccinate children were taunted or stoned. Although Nigerian health authorities have resumed the eradication program, the damage was done. Polio rebounded in northern Nigeria and spread to at least 17 other countries that had been polio-free. Sudan is one of them. The number of confirmed cases of polio-induced paralysis in Sudan soared to 54, a dramatic and dangerous rebound in a country that had eradicated the virus just four years ago. 【題組】44. According to the passage, which poses the greatest obstacle?
(A) Indolence.
(B) Immaturity.
(C) Infidelity.
(D) Ignorance.
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