Which of the following in-text citations is correctly cited?单项选择题

A

It was determined that there is a positive correlation between the two variables (J. Smith, 2008).

B

There was a positive correlation between the two variables (Smith, 2008).

C

Smith said there is a positive correlation between the two variables.

D

(Smith, 2008) determined that there is a positive correlation between the two variables.

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