答案应该是C啊.
1 Reading is a good hobby,and it can bring you happiness and success -------表示并列.
2 Reading is a good hobby because it can bring you happiness and success -----强调原因.
3 Reading can bring you happiness and success,so it is a good hobby.-----强调结果.
在你的句子裏面,选B作为答案貌似讲不过去.