Vitamin D gets produced when animals are exposed to direct sunlight, for＿reason, it
is always advisable to give them chances to spend time in the sun.

A．whoseB．that 　
C．whichD．its

C

解析試題分析：考查定語(yǔ)從句。句意：當(dāng)動(dòng)物直接接觸陽(yáng)光時(shí)維生素D 就會(huì)產(chǎn)生，因?yàn)檫@個(gè)原因，給他們適合的時(shí)間去曬太陽(yáng)是非常明智的。Which代指上面這個(gè)原因，故選C項(xiàng)。
考點(diǎn) : 考查定語(yǔ)從句

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