I just don’t understand ________ that prevents so many children at school from being as happy as one

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I just don’t understand ________ that prevents so many children at school from being as happy as one might expect.

A：what it i

B：what it doe

C：what is it

D：why is it

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A

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阅读短文，判断下列句子是否正确

I was only nine years old when I learnt how to use a computer．My mother is my first teacher．I know how to type，how to copy a file，and how to visit a website on the Internet．One day，mom was not at home．I turned on the computer and began to learn how to chat on net．The first one I met there was a boy called Tom．He greeted me politely．When he knew that I was only a 9-year-old girl and almost knew nothing about chatting on net，he started showing me how to use the chatting tools，how to download，and how to send e-mails．I learnt a lot from him．

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