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Choose the correct version for the following problematic citation:

Original $($from MacDonald's $2010$ article$)$: Literary studies and discourse studies are entirely different. This divide has been rooted in understandings about value and purpose.

Problematic Citation: MacDonald suggests that a great difference exists between discourse studies and literary studies. "This divide has been rooted in understandings about value and purpose" $(618).$

Select one:

a$.$ MacDonald suggests that a great difference exists between discourse studies and literary studies: "This divide has been rooted in understandings about value and purpose" $(618).$

b$.$ MacDonald suggests that a great difference exists between discourse studies and literary studies. "This divide has been rooted in understandings about value and purpose" $($p$.618).$

c$.$ MacDonald $(2010)$ suggests that a great difference exists between discourse studies and literary studies: "This divide has been rooted in understandings about value and purpose" $($p$.618).$

d$.$ MacDonald suggests that a great difference exists between discourse studies and literary studies: "This divide has been rooted in understandings about value and purpose" $($p$.618,2010).$

e$.$ MacDonald $(2010)$ suggests that a great difference exists between discourse studies and literary studies. "This divide has been rooted in understandings about value and purpose" $($p$.618).$