Dood what was the answer?
Ah, my bad son. I believe you got this one right again, the answer was (D) October 31st. After a lease expires, like here, and the parties go on a month-to-month tenancy, 30 days notice must be given by the Landlord to the Tenant that the Landlord wishes to Terminate. The catch is that the Landlord is prohibited from effectuating that 30 days notice mid-term. Therefore, the Landlord must allow the full month's period
to expire after notice is given before the lease can be considered terminated. Since her month to month period started on the 1st of each month here, the Landlord can't cut it short half way through; he has to let the term expire as it normally would.