Read the following context and choose the best option to answer the question.
Context: Apparently I needed to get an application * and * a check to the woman for the apartment I saw and loved . She did not tell me this . My mother sent her some questions since she was co - signing the application , two days after I got the applcation . She was n't responded to , and when I found the woman to ask her why , it turned out she rented the apartment out . I have two and a half weeks to find an apartment and move into it .
Question: What role does the mom serve for the application ?
Options: 
A. Sub - leaser
B. Landlord
C. Guarantor
D. Tenant


C