What constitutes grounds for a landlord to enter a tenant's property according to regulations?

The correct choice reflects a fundamental right of landlords to maintain their properties, which includes performing necessary repairs and maintenance. This provision is vital for ensuring the safety and habitability of the rental unit. When a landlord needs to enter the property for these purposes, they are typically required to provide the tenant with reasonable notice beforehand, except in emergency situations. This procedure helps protect the tenant's right to privacy while enabling the landlord to fulfill their responsibility of keeping the property in good condition.

The other options, while they may carry some validity in specific contexts, do not align as closely with standard landlord-tenant regulations. Collecting rent is often done in mutually agreed upon ways that do not require direct entry into the unit, and showing the property to prospective buyers usually requires prior notice and agreement from the tenant. Surprise inspections are generally not permissible as they infringe upon the tenant's right to privacy and security without just cause.