Went to the store is not a complete sentence because there is no subject going to the store.
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Answer:
a. Adult students are frequently motivated to return to school... (Alex, Marks, & Jones, 2005).
Explanation:
It is important to consider that when information is paraphrased and you need to cite it, you have to include both the author/authors and the date such as in the example above. And although it is not a requirement, it is better to also include the number of the page from which the information was taken.
Mount Sutro and Land's end