下列哪一项最符合学术论文的语体风格？

下列哪一项最符合学术论文的语体风格？
A.It’s a very interesting and practical study.
B.It is a very interesting and practical study.
C.In my opinion， it is a very interesting and practical study.
D.I think it is a very interesting and practical study.
正确答案：It is a very interesting and practical study.