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which person could provide the best professional reference?
1.the ceo from the last place of employment
2.a teacher from middle school summer camp
3.a supervisor from a one-day volunteer activity
4.a direct supervisor from a current summer job

1.the CEO from the last place of employment

Explanation:

The CEO stands or look better as being cited as a professional reference because he or she looks better in the eyes of who ever views your profile as a good point of referencein what ever capacity you want to use the referencing.

the answer would be  

c. neighborhood watch

hope this .