Which of the following is an example of a two-storey house?

The correct answer is based on the architectural features and the layout of the homes in question. A two-storey house is defined by having two levels or floors, allowing for living space to be distributed over two separate vertical areas. Ella's house exemplifies this design, indicating that it contains a second floor with additional rooms or living space above the ground level.

This architectural style is often chosen for its aesthetic appeal and the additional living area it provides without expanding the building's footprint on the property. Understanding the characteristics of different house types is essential in real estate, as it helps potential buyers identify homes that fit their needs regarding space, layout, and ultimately, lifestyle. In contrast, the other houses listed do not have the same two-storey configuration, particularly if they might be one-storey homes or structures lacking the defined upper level characteristic of two-storey designs.