Mort Is the Owner of an Apartment Building Containing Ten

Mort is the owner of an apartment building containing ten identical apartments.Mort resides in one apartment and rents out the remaining units.For 2017,the following information is available: What amount should Mort report as net rental income for 2017?
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A) $12,750
B) $13,500
C) $13,750
D) $14,400
E) None of the above