单项选择题

文书，是指社会组织或个人在各自活动中用来记录和传递信息的书面文字形式。“文书”一词，最早见于（）
A、秦朝
B、西汉
C、东汉
D、西周

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In the sentence “An initial investigation of a rainfall-induced slope failure with coupled MPM has been presented in this paper”, what does the phrase “has been presented in this paper” indicate?
A、the gift the researchers got
B、what the researcher wants to say
C、the research problem of the study
D、how the paper is written

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C.
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