Which statement about fire walls is true?

Masonry is commonly used for fire walls primarily due to its noncombustible quality, which is essential in preventing the spread of fire between different sections of a building. This material is effective in containing fires and protecting the structural integrity of both parts of a structure it separates. Fire walls must be able to withstand high temperatures without igniting or allowing flames to pass through, and masonry provides that strength and durability.

The other options do not accurately represent the facts about fire walls. For example, wood is a combustible material and thus not suitable for effective fire walls. The assertion that fire walls are only needed in residential buildings is misleading, as they are crucial in many types of structures, including commercial ones, to enhance safety and compliance with fire codes. Lastly, most fire walls are not made from reinforced plastic, as that material is generally combustible and fails to meet the necessary fire safety standards required for fire walls.