Some parents are greatly worried

Some parents are greatly worried ___ their children fail to do well in their studies.
They blame either genetic （遗传的）factors,malnutrition,（营养不良）or laziness,but they never take into consideration these non-intelligence factors.
A.why B.when C.how D.whether
为什么不选D

不符合原意 与下一句有矛盾
句意 学习不好 担忧 再找原因 学习好 就不用担忧
但跟我们老师的说法不一样 老师说 考得好 总结 下次更考好

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