The fact that those interested in employment are advised to inquire in-store is an example of C. External selection.
This refers to an employment type where those who are allowed to be employed are people from outside the company alone and not current staff.
In this case, Lululemon is asking for prospective from outside the store to inquire in the store. This means that those to be selected will come from outside.
In conclusion, option C is correct.
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