Unfortunately,very few sheep ___ the severe winter last year.A.due B.reliable C.available D.familiar为什么选A?请翻译整句

Unfortunately,very few sheep ___ the severe winter last year.A.due B.reliable C.available D.familiar为什么选A?请翻译整句
Unfortunately,very few sheep ___ the severe winter last year.
A.due B.reliable C.available D.familiar
为什么选A?请翻译整句

Unfortunately,very few sheep ___ the severe winter last year.A.due B.reliable C.available D.familiar为什么选A?请翻译整句
其他三个意思不对
翻译为：很不幸,去年只有很少一部分羊能度过寒冬

很不幸，去年只有很少一部分羊能度过寒冬

不幸的是，只有很少一部分羊能度过严寒的冬日.
其实此句中的due是源于due to这个词组，意思是：由于, 应归于
在此句中due就译作由于，是对原因的一种的解释