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As there is less and less coal and oil,scientists are explor

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As there is less and less coal and oil,scientists are exploring new ways of making use of ______ energy,such as sunlight,wind and water for power and fuel.
A.primary B.alternative C.instant D.unique
怎么理解
根据意思看选B,随着煤和石油的数量减少,科学家在寻找替代能源,例如太阳能,风能和水能.只有alternative有另一种,另外,其他的意思.所以选B.