Final answer:
Under the Residential Tenancies Act, a landlord can enter a person's residence if they give 24 hours notice in writing or if there is an emergency.
Step-by-step explanation:
Under the Residential Tenancies Act, a landlord can enter a person's residence if they give 24 hours notice in writing or if there is an emergency. This means that options A and B are both correct. The Act provides guidelines and restrictions on when a landlord can enter a tenant's residence to ensure the privacy and rights of the tenant are respected. For example, in the case of an emergency, the landlord may need to enter the residence immediately to resolve the situation.