Cheri North has a month-to-month tenancy. She pays her rent of 880 on the first day of each month. ...

Cheri North has a month-to-month tenancy. She pays her rent of 880 on the first day of each month. On January 15, 2009, Cheri received notice from her landlord that her rent would be increasing to 900 per month. When is the first time the landlord can demand the 900 rent from Cheri?
 A) The landlord can collect the extra 20 on January 15, 2008 and receive 900 on February 1st and thereafter
 B) The landlord can collect the 900 on February 1st and every month after
 C) The landlord can collect the 900 beginning March 1, 2008
 D) None of the above